Database Develop

[Q] Screen inaccuracy issues

I know that this has been a fairly common complaint about the Nexus One but i'm wondering, roughly what percentage of people actually have this issue? To clarify, i mean the problem whereby touching the screen in one place is actually registering elsewhere on the screen.
I've had this problem since buying my n1 and having to constantly turn the screen off and back on again was driving me nuts. Finally i sent the unit back to Vodafone for repair and they in turn sent it to HTC to be fixed. So yesterday i got it back with an enclosed statement along the lines of "we have fixed your fault etc..".
Three minutes into using the damn thing and the fault crops up again. So much for that! To be fair to Vodafone they are sending out a replacement unit now but of course i'm concerned that even that will have the same issue.
What are the odds?

Here is the same.
To developers: the fact that resetting the screen fix the problem makes me to ask if there isn't a way to make the screen re-calibrate itself every X seconds/minutes, without shut off and on the screen every time. Seems to be until now the only solution to this extremely annoying issue.

It really is a bizarre one. I've seen people discussing whether it's a hardware or software issue but nobody seems to have a definitive answer. If it were a hardware problem, surely it would be constant/permanent? If it's a software issue i would have thought that somebody would have bug-fixed it by now? Especially as it seems so prevailant.
I'm stumped!
Other than this one problem though i am completely in love with this phone. The device itself feels solid, durable and pleasant to use. Android is improving all the time and it always impresses when you demonstrate to the un-initiated what the device is capable of. So close to perfect...but not quite!
EDIT... This from the wiki.. "- Q5: Sometimes my screen registers touches in incorrect places, and I need to turn the phone off and on to make it work correctly again
A: This is a hardware problem, nothing can be done about it. Nexus One's digitizer sucks.
Ho-Hum.

I have experienced this problem on android 2.1 ever since upgrading 2.2/2.2.1, I haven't had the problem. I'm very happy with my screen
Sent from my Nexus One using XDA App

msavic6 said:
I have experienced this problem on android 2.1 ever since upgrading 2.2/2.2.1, I haven't had the problem. I'm very happy with my screen
Sent from my Nexus One using XDA App
Click to expand...
Click to collapse
That suggests a software problem although i have had it on 2.1, 2.2 and now 2.2.1. I would say that it has happened to me within three minutes of using the phone, 50% of the time within that three minute window. In other words it's cropped up in half the texts/emails i have sent where i have had to do the screen off/on thing to complete the message.
Very annoying.

It has to do mostly with the way people hold their phones, the possibility of registering false touches - including, for example, touching the screen with fingers that aren't completely dry. Some have the issue more than others.
HW issues still can have SW workarounds sometimes. I'm not sure if it's the case. HW and SW need to be analyzed to find one, if exists.
There is no "calibrating" capacitive touchscreen. Resetting its controller might have effects like missing touches and other random screen misbehavior (for example - if the controller is tracking fingers, resetting it would cause it to lose the tracking).

Since getting my phone back from 'repair' the issue is less frequent, suggesting that it's not a usage problem as i'm obviously still using the phone in the same manner as before. Instead it seems that various devices suffer from the problem in varying degrees.
I suppose if i knew what they had actually done to the phone while it was being tended to it might help us discover why the frequency of the problem has been reduced. I know that the digitizer wasn't replaced as the phone came back with the same screen protector on it as it had when i sent it off. That being said, they obviously did something. I just don't know what!

Most probably replaced the phone's MB.

Try upgrading to the latest radio - the issue will probably not be 100% solved, but now I only get it maybe once a month or so...

I may tell them not to bother sending out a replacement. It's happening far less often since it was returned and (going by the poll results), there's a good chance that the replacement could actually be worse than this one is now.
Perhaps the 2.3 update will jar something loose.

ATTENTION PLEASE!!
after flashing miui latest ROM i've never had touchscreen issues anymore in over 20 hours of hard usage (also with the phone in charge!!).
I don't believe is a coincidence, developers please ask miui developers if they have integrated a code to fix this issues.
Thanks!
Sent from my Nexus One using XDA App

pyngwie said:
ATTENTION PLEASE!!
after flashing miui latest ROM i've never had touchscreen issues anymore in over 20 hours of hard usage (also with the phone in charge!!).
I don't believe is a coincidence, developers please ask miui developers if they have integrated a code to fix this issues.
Thanks!
Sent from my Nexus One using XDA App
Click to expand...
Click to collapse
could you please download Multitouch Visible Test
http://www.appbrain.com/app/multitouch-visible-test/com.batterypoweredgames.mtvistest
and report back?

xyellx said:
could you please download Multitouch Visible Test
http://www.appbrain.com/app/multitouch-visible-test/com.batterypoweredgames.mtvistest
and report back?
Click to expand...
Click to collapse
I have already restored cyano 6.1.1.
However, about "multitouch issues" I mean inaccuracy, the fact that the touch is recognised in another point of the screen (particularly when you press the bottom part of the panel). I didn't verified the axes-inversion issue, but I'm almost sure that it persists.

The "touch inaccuracy" is nothing else than the usual axis-swapping thing. When accidental dual touches (palm/holding fingers/water/etc) happen, the digitizer goes nuts.

Jack_R1 said:
The "touch inaccuracy" is nothing else than the usual axis-swapping thing. When accidental dual touches (palm/holding fingers/water/etc) happen, the digitizer goes nuts.
Click to expand...
Click to collapse
I don't think so....I pay attentions when the screen goes crazy. I'm absolutely sure that (in charge for example) my touch is ONE.

The only times I was able to trigger the "screen nuts" effect, were when I was typing 2-fingered, and fast - making it register dual touches. Moreover, sometimes a single touch with a single finger is reported as series of touches. Once it happens, it stays until screen off.

Jack_R1 said:
Moreover, sometimes a single touch with a single finger is reported as series of touches. Once it happens, it stays until screen off.
Click to expand...
Click to collapse
I mean this....since I moved to MIUI this is not happened anymore.

Since I uninstalled Htcime the inaccuracy issues seem less so far! Almost only with the phone under charge ...much much better than before! Dunno why....
Sent from my Nexus One using XDA App

unusual modem noises, possible malware?

hi, been searching the forum on this but with no results:
right now i have the cm9 update 27.04.2012 running with semaphore 1.1.1. kernel.
My modem seems to be activated when it shouldn't. No data connection is running, and yet the phone seems to send signals more often and in a wider extent then i'm used to register with other phones that only check their network status. It tends to keep transmitting, which I can hear in my loudspeakers as a steady sound which can go up to half a minute, as opposed to the regular rhythmic, morse-like interference which ceases after a few seconds, that we all know.
I wonder if anyone can point me to the reason for this, as it uses battery, gets on my nerves, and might even be rooted in some kind of intrusive piece of software.
Maybe someone also knows an app with which I could see what exactly uses the modem, and how?
On a side note: A few weeks ago I had a similar experience, but it didn't seem to be related to my phone, as moving it around didn't change the sound in the speakers. This was the strangest thing, because I only had this phone, and the noise kept going even though I had removed the battery. The only explanation would be another phone somewhere around my room in another appartment, although the next possible spot would be through the wall in the next house, which is the next building, which is highly improbable. Any ideas on what else besides a cellphone let alone an electronic device could have caused this?! i have even been thinking about surveillance measures by the police...

better ask in the cm9 thread ull get better answer

thanks, i'll do that...

Z1 Touchscreen Issues

Does anyone have issues with the touchscreen skipping every once in a while? Occasionally, there is an area on the lower half of the screen that seems to be insensitive, but if you start touching around it, it goes back to normal.
I've discussed this with some fellow Z1 owners and it appears to be a relatively common issue. There is some discussion that it may be due to overheating or a software issue.
Anyone else have this problem?

Had this once while my device overheated hard(~47-48°).
Not sure if I have to be concerned about that, because otherwise it works fine.

koopa101 said:
Does anyone have issues with the touchscreen skipping every once in a while? Occasionally, there is an area on the lower half of the screen that seems to be insensitive, but if you start touching around it, it goes back to normal.
I've discussed this with some fellow Z1 owners and it appears to be a relatively common issue. There is some discussion that it may be due to overheating or a software issue.
Anyone else have this problem?
Click to expand...
Click to collapse
Same here
Sent from my C6903 using XDA Premium 4 mobile app

At first I thought it was an issue with crappy screen protectors. The Z1 already has a anti-crack film on the screen so I thought that adding a poorly made screen protector would create too much distance from my touch to the sensor. However, I've tried replacing the screen protector and also asked other people with varying brands of screen protectors and it seems that the issue still persists.
The issue seems to occur most often on the password screen for me (which is particularly annoying).

I've had it too, lower half of screen does not register slides on login screen for a brief moment.. No overheat!
Sent from my C6903 using Tapatalk

No overheat here 2 but with the same issue.
Also the last days i think that all the screen sometimes is more insensitive than usual.I have to touch 2-3 times to do what i want.
I think that is a hardware issue.

Have it sometimes as well sadly! Can't figure out when exactly it's happening though..
I find it very annoying when I'm scrolling and at the bottom part of the screen, the scrolling becomes a click, which brings me to a place I did not intend to go to. Hope it's software, but can't imagine that.

Happens to me as well, regardless of device temperature. Based on the seemingly random nature of the issue, it should be a simple fix via software update. A similar bug persisted on the 2013 Nexus 7 devices when you laid them flat on a surface.

koopa101 said:
Does anyone have issues with the touchscreen skipping every once in a while? Occasionally, there is an area on the lower half of the screen that seems to be insensitive, but if you start touching around it, it goes back to normal.
I've discussed this with some fellow Z1 owners and it appears to be a relatively common issue. There is some discussion that it may be due to overheating or a software issue.
Anyone else have this problem?
Click to expand...
Click to collapse
Same problem here!!!
I think is a hardware issue. When you touch the alu frame the phone works fine. If the phone is on the table or in a cover the issue are immediately there.
Sorry for my bad english. Hope you understand

I noticed some small things and thought it was me but I guess this makes sense.
Could be worse, my previous Note 3 had multitouch issues and had problems register several fingers :silly:

Considering how common the issue appears to be, I find it hard to believe that this is a hardware issue.
I also don't believe it's related to overheating since it seems to happen even when I haven't used the phone at all for a long time.
It feels like a software issue to me since the issue sends to go away if you touch another section of your screen

koopa101 said:
Considering how common the issue appears to be, I find it hard to believe that this is a hardware issue.
I also don't believe it's related to overheating since it seems to happen even when I haven't used the phone at all for a long time.
It feels like a software issue to me since the issue sends to go away if you touch another section of your screen
Click to expand...
Click to collapse
When you touch the alu frame the issue is not there. Only when you use phone without touching the frame.
Must be some kind of hardware issue...
Sent from my iPad using Tapatalk HD

I am having the exact same issue. The weird thing is, is that it doesn't always fail to register my finger. I've gone a few days without it, then suddenly it's back again. Also in the Xperia Diagnostics app I could then see the phone failing to register a proper line, then 20 seconds later it's gone. Weird thing indeed.
Sent from my C6903 using XDA Premium 4 mobile app

nonamedk said:
When you touch the alu frame the issue is not there. Only when you use phone without touching the frame.
Must be some kind of hardware issue...
Sent from my iPad using Tapatalk HD
Click to expand...
Click to collapse
Is this the case? I don't think I've ever used my phone without touching the frame somehow.

koopa101 said:
Does anyone have issues with the touchscreen skipping every once in a while? Occasionally, there is an area on the lower half of the screen that seems to be insensitive, but if you start touching around it, it goes back to normal.
I've discussed this with some fellow Z1 owners and it appears to be a relatively common issue. There is some discussion that it may be due to overheating or a software issue.
Anyone else have this problem?
Click to expand...
Click to collapse
Yes, I have it as well.. First of all though, to reply to a lot of people on this thread, it happens regardless of "flat surface, touching the frame, overheating", or anything else. It seems to be completely random with me. Sometimes everything is perfect, then it goes nuts for no apparent reason whatsoever. I'm almost sure it's a software issue, and hope sony will address this issue soon!

it also happens sometimes to me.
the only thing that helps is to touch the ground of the ac power socket. it seems like the screen needs much more potential difference between the pointer and the screen itself and after a while of using it the pointer (you and your fingers) are more loaded.
thats my theory to it.

Jimmyness said:
Yes, I have it as well.. First of all though, to reply to a lot of people on this thread, it happens regardless of "flat surface, touching the frame, overheating", or anything else. It seems to be completely random with me. Sometimes everything is perfect, then it goes nuts for no apparent reason whatsoever. I'm almost sure it's a software issue, and hope sony will address this issue soon!
Click to expand...
Click to collapse
Unfortunately, unlike the rooting camera bug, it doesn't sound like Sony has even acknowledge it at all.

Exactly this.
http://www.youtube.com/watch?v=h0sqwwUoEPc
I often have to attempt inputting my password multiple times before I can finally get it right. I have since switched to PIN unlock. Really wish there was some sort of response from Sony.

I'd you're using pie then stop using it and retry the affected area. I had this issues because of the activation area causing certain keys on the keyboard to become non responsive.
Sent from my Z1.

Has anyone tryed the touchfwtool?
URL itechdestiny.com/xperia-touch-screen-solution-touchfwtools-apk-download/
My phone is on the way back from repair. They only have calibrated the screen.

Strange screen flicker?

I have only had my tf701 a day but Ive noticed sometimes when docked to the keyboard if you dont touch the mouse for a few seconds sometimes when you move the mouse again it will make a flicker around where the mouse is located, it doesnt always do it, just wondering if anyone has noticed this or is it a fault with my tablet?
I can live with it, but if there is a known fix it would be nice to sort it.
Thank You

After a bit of messing about I think it only does it with live wallpapers? Which isnt a problem as I wont be setteling on a live wallpaper anyway found them far too distracting.
Would still be nice to know this is fixable though.
Thank You

I was wrong its not to do with live wallpapers, just seems to do it on some apps, for example if I go to apex launcher then settings, if I leave the mouse for 10 seconds or more than rouch to move it, it makes the strange flash across the screen.
Could anyone else please test if theirs does this?
Thanks

Asus considers it to be a feature - not a bug - and calls it "smart backlight adjuster".
For most people it goes away upgrading to 4.3 which I guess you haven't done?

berndblb said:
Asus considers it to be a feature - not a bug - and calls it "smart backlight adjuster".
For most people it goes away upgrading to 4.3 which I guess you haven't done?
Click to expand...
Click to collapse
Yeah I am running 4.3?
I have noticed it does it on the drawer too, only when using the dock and leaving the mouse dormant for 8 seconds or more than moving it again it sends horizontal lines across the screen for a split second, is this the bug *ahem* feature you speak of?
Thanks

berndblb said:
Asus considers it to be a feature - not a bug - and calls it "smart backlight adjuster".
For most people it goes away upgrading to 4.3 which I guess you haven't done?
Click to expand...
Click to collapse
Also when you say adjuster, that sounds like it would be something that requires adjusting but it still does this with screen set to full brightness, or least brightness, with auto off, also wit outdoor on or off, it still does the strange flicker.
I can happily live with it, doesnt bother me that much just dont want it to be something that is going to get worse as Im very close to unlocking the device and dont want to blow all warranty if I already have a fault.
Thanks

dougie175 said:
Also when you say adjuster, that sounds like it would be something that requires adjusting but it still does this with screen set to full brightness, or least brightness, with auto off, also wit outdoor on or off, it still does the strange flicker.
I can happily live with it, doesnt bother me that much just dont want it to be something that is going to get worse as Im very close to unlocking the device and dont want to blow all warranty if I already have a fault.
Thanks
Click to expand...
Click to collapse
No what I had in mind was the screen dimming and brightening. What you describe sounds more like the "flashing black lines" the TF700 has (which seems to be due to some nvidia driver issue). I have not noticed those on the TF701 but then, I am so used to them from the 700 I probably wouldn't even notice. Have not read anything about them in the forums though, so I suspect your situation is unique.
Are you in the US? Get a Squaretrade warranty. I find the peace of mind is worth the $75 since they don't care about locked/unlocked...

berndblb said:
No what I had in mind was the screen dimming and brightening. What you describe sounds more like the "flashing black lines" the TF700 has (which seems to be due to some nvidia driver issue). I have not noticed those on the TF701 but then, I am so used to them from the 700 I probably wouldn't even notice. Have not read anything about them in the forums though, so I suspect your situation is unique.
Are you in the US? Get a Squaretrade warranty. I find the peace of mind is worth the $75 since they don't care about locked/unlocked...
Click to expand...
Click to collapse
No I am in the UK Im afraid, hmmmmm its deffo a tf701 not a 700 hehe
Can you please test for me open your drawer, leave the mouse in the centre for 10 seconds then move it and see if it does the black lines?
Also did the issue ever get resolved or get any worse on the 700 or is it just something the user gets used to?
Thank You

dougie175 said:
No I am in the UK Im afraid, hmmmmm its deffo a tf701 not a 700 hehe
Can you please test for me open your drawer, leave the mouse in the centre for 10 seconds then move it and see if it does the black lines?
Also did the issue ever get resolved or get any worse on the 700 or is it just something the user gets used to?
Thank You
Click to expand...
Click to collapse
Don't have the keyboard for the TF701 - yet. So I can't help you with your test.
The black lines on the 700 are benign - I don't even notice them anymore. But I don't think my 701 has them, so there is a possibility that your tablet has a glitch...

berndblb said:
Don't have the keyboard for the TF701 - yet. So I can't help you with your test.
The black lines on the 700 are benign - I don't even notice them anymore. But I don't think my 701 has them, so there is a possibility that your tablet has a glitch...
Click to expand...
Click to collapse
Thanks, I have sent Asus an email to see if they will help me, I bought the tablet second hand though so they probably have no interest even though it is only 3 months old and hasnt been out long enough to be out of warranty.
If they will fix or replace it for me ill take that, if not i can happily live with it

dougie175 said:
No I am in the UK Im afraid, hmmmmm its deffo a tf701 not a 700 hehe
Can you please test for me open your drawer, leave the mouse in the centre for 10 seconds then move it and see if it does the black lines?
Also did the issue ever get resolved or get any worse on the 700 or is it just something the user gets used to?
Thank You
Click to expand...
Click to collapse
Just tried your test and I see no lines. Maybe because I'm not on the stock rom exactly?

dougie175 said:
Thanks, I have sent Asus an email to see if they will help me, I bought the tablet second hand though so they probably have no interest even though it is only 3 months old and hasnt been out long enough to be out of warranty.
If they will fix or replace it for me ill take that, if not i can happily live with it
Click to expand...
Click to collapse
I don't want to be negative here, but waiting for Asus' response is pretty useless. Their support staff has two answers for questions beyond: "Where do I find my pictures?" and they are:
a) Factory reset, and if that does not help:
b) Send it in for repair - which may or may not cost you a bundle...
If you do send it in get written confirmation that your tablet is still under warranty first and take pictures of your tablet documenting its condition, how you packed and shipped it etc.

Thanks for the replies
This is what I get

dougie175 said:
Thanks for the replies
This is what I get
Click to expand...
Click to collapse
That is entirely different from what I thought it was and I have no idea what could be causing it. Do you get that ever when the dock is not connected?

berndblb said:
That is entirely different from what I thought it was and I have no idea what could be causing it. Do you get that ever when the dock is not connected?
Click to expand...
Click to collapse
No it cannot be replicated when the dock is not connected or when just touching the screen with or without the dock connected, it only does it on some areas of the system such as drawer and some apps if the mouse if left dormant for 8 seconds or so then moved.
I have done a factory reset and cold boot as requested by Asus, but the problem still persists as shown here in the new video
http://s9.photobucket.com/user/dougie175/media/Mobile Uploads/MOV_0020.mp4.html

dougie175 said:
No it cannot be replicated when the dock is not connected or when just touching the screen with or without the dock connected, it only does it on some areas of the system such as drawer and some apps if the mouse if left dormant for 8 seconds or so then moved.
I have done a factory reset and cold boot as requested by Asus, but the problem still persists as shown here in the new video
http://s9.photobucket.com/user/dougie175/media/Mobile Uploads/MOV_0020.mp4.html
Click to expand...
Click to collapse
Mine definitely doesn't do that. Try switching the cursor mode to gesture mode for me and see if that makes a difference. (I doubt it will but you never know)
Then go to the system settings, about and click the build number 7 times to enable developer mode. Then go into developer settings and look for force GPU rendering and disable hardware overlays. Check both. Reboot - any difference?

Check the cables
When troubleshooting a screen flicker, I always check the cables first. Several TechRepublic members agree. Ian C B, Bruceb, Crjordan, and Aqmike all suggested checking the video and monitor power cables before doing anything else. Ian C B reminds us to confirm that the cables are screwed in tightly and to replace the cables with new ones to see if the problem persists.
"The color changes are almost always a faulty wire in the cable," Crjordan said. "Try working the cable back and forth near both connectors. If this causes the color change, you could have a broken wire in the cable, or a loose pin in one of the connectors. Make sure the cable is out of the way (from feet, hands, and other objects). You may also try zip-tying it to itself or another stable object until you can replace either the cable or the monitor."
Check the environment
If a cable isn't the culprit, then the user's workspace should be next on your hit list. Monitors are notoriously sensitive to magnetic fields. Speakers, florescent lights, fans, cell phones, radios, and any other electrical device can cause a wide range of monitor problems. (See Figure A.) "Check what's around the [monitors]," Vilefileman said. "Cell phones are known to cause screen flickers, among other things, and plugging a radio or fan into the same receptacle can also cause screen flickers."
Maybe its like some kind of electrostatic interefereence in your environment more to do with the power being supplied to the device. Check cables. Etc. I think its interference or something.

sbdags said:
Mine definitely doesn't do that. Try switching the cursor mode to gesture mode for me and see if that makes a difference. (I doubt it will but you never know)
Then go to the system settings, about and click the build number 7 times to enable developer mode. Then go into developer settings and look for force GPU rendering and disable hardware overlays. Check both. Reboot - any difference?
Click to expand...
Click to collapse
I have noticed one other thing, it will not do the fault on first reboot, until the screen is locked, once unlocked it starts doing this fault
Gesture mode made no difference
Also done the developer options and they made no difference :crying:

sbdags said:
Mine definitely doesn't do that. Try switching the cursor mode to gesture mode for me and see if that makes a difference. (I doubt it will but you never know)
Then go to the system settings, about and click the build number 7 times to enable developer mode. Then go into developer settings and look for force GPU rendering and disable hardware overlays. Check both. Reboot - any difference?
Click to expand...
Click to collapse
I was wrong disabling hardware overlays does seem to resolve the issue?
However each time I reboot the option is un ticked that's why I thought it didn't do it

YayYouFixedIt said:
Check the cables
When troubleshooting a screen flicker, I always check the cables first. Several TechRepublic members agree. Ian C B, Bruceb, Crjordan, and Aqmike all suggested checking the video and monitor power cables before doing anything else. Ian C B reminds us to confirm that the cables are screwed in tightly and to replace the cables with new ones to see if the problem persists.
"The color changes are almost always a faulty wire in the cable," Crjordan said. "Try working the cable back and forth near both connectors. If this causes the color change, you could have a broken wire in the cable, or a loose pin in one of the connectors. Make sure the cable is out of the way (from feet, hands, and other objects). You may also try zip-tying it to itself or another stable object until you can replace either the cable or the monitor."
Check the environment
If a cable isn't the culprit, then the user's workspace should be next on your hit list. Monitors are notoriously sensitive to magnetic fields. Speakers, florescent lights, fans, cell phones, radios, and any other electrical device can cause a wide range of monitor problems. (See Figure A.) "Check what's around the [monitors]," Vilefileman said. "Cell phones are known to cause screen flickers, among other things, and plugging a radio or fan into the same receptacle can also cause screen flickers."
Maybe its like some kind of electrostatic interefereence in your environment more to do with the power being supplied to the device. Check cables. Etc. I think its interference or something.
Click to expand...
Click to collapse
Theres not really any cables I can check, I have checked the connection is pushed in correctly which it is.
I have just tried to replicate the error outside with my phone turned off inside the house so no chance of interference and the error was still present.
Don't think this is quite the issue as it only does it when moving the mouse after leaving it on certain apps for 8 seconds.
Thank you for the help though

Intermittent loss of touch response

Just retired my 2 XL and got a like-new 4 XL. Loving it so far, except one nagging issue.
Randomly the top 30-50% of the display stops registering taps (touch). It's easy to fix by turning the display off then back on, but I'm concerned it may be a hardware issue.
Interestingly, when this happens and something that is full screen and scrollable such as a contact list or app drawer is in the foreground, I can drag from below the "no touch area" to the top of the screen, but I can't start a drag at the top. So, it can sense touch in the troubled half, it just won't register taps.
I have done tons of searches. I see lots of people saying Android 12 had touch issues out of the gate, but was supposedly fixed. I disabled the block_untrusted_touches. I have checked any app that has draw over other apps permissions. I have tried with high touch sensitivity on and off. I have paid attention to running apps when it happens. I installed a LogCat reader looking for touch related issues when the problem occurs. I tried safe mode, but due to the intermittent nature of the problem, and the fact that safe mode disables most functionality, it really wasn't a good long term test.
I have yet to pinpoint this.
Sometimes it doesn't happen for a day, other times it's multiple times per day. So trial and error takes time because just when you think you licked the problem, it rears it's ugly head again.
I'm running LineageOS 19.1 at the moment (which I had also run on my 2XL with no issues). It is rooted. No apps force closing or crashing.
Has anyone else seen this on the 4XL?

Definitely interesting, never heard of that. I had some touch issues, specially if the display gets wet where it register touch, but poorly to the point I need to restart the device and dry out the screen. Though in my case the creen is completely cracked, so I suspect that's the cause as it didn't happened before.
Though I had a similar to yours but with the battery.
The problem was that the phone would randomly shut down, and that would happen more often when it was on my pocket.
This made the phone very un stable as sometimes I would have the phone completely off and didn't even know about it.
So I decided to open it and have a look at it. It turn out that the problem was the flex cable that connected the battery with the logic board, it was just slightly tore on one side, but just a tiny I couldn't nearly see it, I had to use another phone to zoom in.
As it was torn, depending on the way the phone was changed the force the gravity made over the cable, causing that sometimes it not enough energy got the phone, causing it to shut down.
Once I replaced it, it never happened again, not a single time.
Maybe you have a similar problem, though as you are rooted and using a custom ROM, that may be the reason, my case was extremely rare.
anyway, good luck