Z3 refuses to sleep. Tried everything - Xperia Z3 Compact Q&A, Help & Troubleshooting

Basically, for a couple days, my Z3C battery drain graph is a straight line going down at 40 degrees. I'd post a pic, but I can't yet (new member limits).
It used to be mostly flat when the phone wasn't used, but not anymore.
What changed? honestly, nothing! I just woke up and noticed that it went down from 100% to 70% during ~7 hours of my sleep. And it's like that ever since. I'm struggling to use the phone for a full day (used to be 2-3 days). The phone is 8 months old.
WHat I did already:
1. Turning off/uninstalling various apps based on their % impact on battery drain
2. Clearing cache
3. Turning down wifi and internet
4. Factory reset with data backup
5. FULL factory reset without touching anything after it
NOTHING worked
My only theory is that battery became bogus and I have to send it for repairs... which means at least 2-3 weeks without the phone and a questionable result (they may as well not consider it broken at all).
Anyone have any ideas on what to do at this point? I'm getting desperate
I wanted to sell the phone in a couple months to buy the Z6 compact, but I obviously can't sell a phone with a faulty battery... which means I won't have funds for the Z6. Sigh..

Kapitanczacki said:
Basically, for a couple days, my Z3C battery drain graph is a straight line going down at 40 degrees. I'd post a pic, but I can't yet (new member limits).
It used to be mostly flat when the phone wasn't used, but not anymore.
What changed? honestly, nothing! I just woke up and noticed that it went down from 100% to 70% during ~7 hours of my sleep. And it's like that ever since. I'm struggling to use the phone for a full day (used to be 2-3 days). The phone is 8 months old.
WHat I did already:
1. Turning off/uninstalling various apps based on their % impact on battery drain
2. Clearing cache
3. Turning down wifi and internet
4. Factory reset with data backup
5. FULL factory reset without touching anything after it
NOTHING worked
My only theory is that battery became bogus and I have to send it for repairs... which means at least 2-3 weeks without the phone and a questionable result (they may as well not consider it broken at all).
Anyone have any ideas on what to do at this point? I'm getting desperate
I wanted to sell the phone in a couple months to buy the Z6 compact, but I obviously can't sell a phone with a faulty battery... which means I won't have funds for the Z6. Sigh..
Click to expand...
Click to collapse
And what about changing NOTHING but just turning the airplane mode ON?
edit: I made a mistake, not OFF but ON!
I had the same problem with my Xperia T and the cause was that I cut the SIM card by myself (from mini sim to micro sim) and I accidentally internally damaged the SIM card. The battery drain was TREMENDOUS and the phone was INCREDIBLY hot that time. I didn't know what was the cause and tried literally everything! Only turning on the airplane mode was stopping the battery drain so I thought maybe the SIM card is damaged. And it was! After replacing one, everything went back to normal.
But what I want to say - your case might be different but... just give an airplane mode a try.
If you are from Poland - check your private messages!

Flight mode does nothing. 100% -> 75% overnight.

Kapitanczacki said:
Flight mode does nothing. 100% -> 75% overnight.
Click to expand...
Click to collapse
Have u tried installing a new rom?
Or a factory reset because its easier?

kimon60 said:
Have u tried installing a new rom?
Or a factory reset because its easier?
Click to expand...
Click to collapse
Yep, like I said in first post, I did factory reset. Twice, in fact.
The phone doesn't eat more battery - with Screen On, it works like it used to, but there is no "screen off" time for battery: the drain seems constant. The phone obviously doesn't go into sleep mode.

Then try Safe Mode in which all 'foreign' apps are not included in the startup procedure.
- push the power button
- long press the Power Off on the screen
- Then a option to restart in safe mode will appear on your screen
- Now you can chack whether your battery drain is a software or hardware problem

HvdW said:
Then try Safe Mode in which all 'foreign' apps are not included in the startup procedure.
- push the power button
- long press the Power Off on the screen
- Then a option to restart in safe mode will appear on your screen
- Now you can chack whether your battery drain is a software or hardware problem
Click to expand...
Click to collapse
Hardware sadly... the battery drain is exactly the same on safe mode+flight mode as with wifi+internet+all apps I have
I still have some months of warranty... should I send it?

Kapitanczacki said:
Basically, for a couple days, my Z3C battery drain graph is a straight line going down at 40 degrees. I'd post a pic, but I can't yet (new member limits).
It used to be mostly flat when the phone wasn't used, but not anymore.
What changed? honestly, nothing! I just woke up and noticed that it went down from 100% to 70% during ~7 hours of my sleep. And it's like that ever since. I'm struggling to use the phone for a full day (used to be 2-3 days). The phone is 8 months old.
WHat I did already:
1. Turning off/uninstalling various apps based on their % impact on battery drain
2. Clearing cache
3. Turning down wifi and internet
4. Factory reset with data backup
5. FULL factory reset without touching anything after it
NOTHING worked
My only theory is that battery became bogus and I have to send it for repairs... which means at least 2-3 weeks without the phone and a questionable result (they may as well not consider it broken at all).
Anyone have any ideas on what to do at this point? I'm getting desperate
I wanted to sell the phone in a couple months to buy the Z6 compact, but I obviously can't sell a phone with a faulty battery... which means I won't have funds for the Z6. Sigh..
Click to expand...
Click to collapse
I had the same problem with my z3c when I went back home to Cyprus for the holidays. In Germany my battery drain during the night is 5-6% with Wifi on (no Stamina Mode), but when I was in Cyprus my battery drain went to like 40% over night. Bear in mind my phone is completely stock, with some disable apps here and there. I used GSam Battery Monitor to see what was going on and I saw that my Phone Radio was using almost the same % as the screen was. I'm thinking maybe this happened because of the firmware or something, I'm currently using .264 for Germany, but when I bought the phone it came with the Greek firmware, and I changed it to the German one during the Lollipop updates. Maybe if you tried flashing another firmware?

Related

Changing Battery causes severe problems.

Hi
On Thursday I received a new battery in the post (my current battery life was abysmal) anyway i changed the battery to charge the new one. After starting the phone i had to select a new language etc. and found that a huge number of my apps were giving the a force close errors. I decided to factory reset my phone, re-downloaded the apps and found the problem resolved.
However earlier today i switched batteries again (wasn't sure that was the cause last time) and it has happened again. Any Suggestions on what is causing it and how to avoid it in the future (other than simply not replacing the battery) or how to rectify it.
Fake/Faulty battery.
jje
No the battery is genuine samsung from a reputable retailer.
If you have to select a new language, it probably means your phone's internal battery has died. Try taking out the battery for 5 minutes, and see if the clock is still accurate.
knowledge is Power. Guard it well.
reallymoreish said:
Hi
On Thursday I received a new battery in the post (my current battery life was abysmal) anyway i changed the battery to charge the new one. After starting the phone i had to select a new language etc. and found that a huge number of my apps were giving the a force close errors. I decided to factory reset my phone, re-downloaded the apps and found the problem resolved.
However earlier today i switched batteries again (wasn't sure that was the cause last time) and it has happened again. Any Suggestions on what is causing it and how to avoid it in the future (other than simply not replacing the battery) or how to rectify it.
Click to expand...
Click to collapse
Are you sure you are letting the phone shut down properly?? When you think it's shut down, press one of the capacitive buttons, if they light up wait until phone vibrates and lights go out, then swap battery. Had the same happen to me a couple of times.
Hello! Me and some other people had similar issues. Read this thread:
forum.xda-developers.com/showthread.php?t=1022044
It looks impossible but I start to believe that a faulty (or a cheap noname) battery can cause problems like this.
I have two spare cheap ebay batteries. I always pop the battery out with the phone still turned on and never a problem...

Xperia T Battery Problems - Like Never Before

First things first, this is my first time posting on XDA Developers and yes I have searched the forums for a similar question/answer and only found one but my I had a small additional problem as well.
Problem 1) My battery indicator is always wrong, one time it says it's 50% and then I restart my phone and then it says 15%, then I play games until it's 12% and then restart again and then the phone now says 20%.
Problem 2) When my battery indicator is incorrect, when I turn off my phone, the xperia T will just restart and then I have to turn it off again.
What I've done;
- I used sony's repair software online (Sony PC Companion)
- Used ICS format option
- Exchanged Xperia T for another one at Carphone Warehouse 2-3 days ago (Original purchase was last week)
- Drained the battery from 100% to 0% and then charged it again.
NOTE: My Xperia T was bought from UK (Carphone Warehouse) and I haven't flashed it onto another ROM nor have I rooted the phone and the phone is unlocked too.
NOTE 2: I had exchange the phone once and still same problems occurred, dunno if I'm "Bad Luck Brian" this week or all certain xperia T's behave this way.
cmr333 said:
First things first, this is my first time posting on XDA Developers and yes I have searched the forums for a similar question/answer and only found one but my I had a small additional problem as well.
Problem 1) My battery indicator is always wrong, one time it says it's 50% and then I restart my phone and then it says 15%, then I play games until it's 12% and then restart again and then the phone now says 20%.
Problem 2) When my battery indicator is incorrect, when I turn off my phone, the xperia T will just restart and then I have to turn it off again.
What I've done;
- I used sony's repair software online (Sony PC Companion)
- Used ICS format option
- Exchanged Xperia T for another one at Carphone Warehouse 2-3 days ago (Original purchase was last week)
- Drained the battery from 100% to 0% and then charged it again.
NOTE: My Xperia T was bought from UK (Carphone Warehouse) and I haven't flashed it onto another ROM nor have I rooted the phone and the phone is unlocked too.
NOTE 2: I had exchange the phone once and still same problems occurred, dunno if I'm "Bad Luck Brian" this week or all certain xperia T's behave this way.
Click to expand...
Click to collapse
I have come across the issue of the phone restarting on power off. Quite strange but yet couldnt isolate as to why it does it.
Just gt my phone exchanged due to a suspected bad microphone, and the new one too restarted on a power off.
The previous one seemed quite good with battery life and the new one is yet on the 1st cycle of drain.
Yes, occasionaly my phone does a restart instead of a power off, but i find it quitw usefull because normally I am rebooting to get into recovery and I hate not having a reboot option...
Well done sony
EDIT
The other thing that bigs me is the random reboots...does anyone else get this on stock kernel. I am advanced v3 stock kernel.
gregbradley said:
Yes, occasionaly my phone does a restart instead of a power off, but i find it quitw usefull because normally I am rebooting to get into recovery and I hate not having a reboot option...
Well done sony
EDIT
The other thing that bigs me is the random reboots...does anyone else get this on stock kernel. I am advanced v3 stock kernel.
Click to expand...
Click to collapse
Good to hear the restart is a common thing
I've had a random reboot once, while running sat nav sw (sygic).
Today I exchanged my phone to Galaxy Note 2, couldn't be happier.
Also, I've contacted Sony before the exchange (and after this thread was posted) and they said that the issue is known by Sony and it's unknown if it's a software or hardware problem for now, wish you guys good luck and hopefully it's a software bug
gregbradley said:
Yes, occasionaly my phone does a restart instead of a power off, but i find it quitw usefull because normally I am rebooting to get into recovery and I hate not having a reboot option...
Well done sony
EDIT
The other thing that bigs me is the random reboots...does anyone else get this on stock kernel. I am advanced v3 stock kernel.
Click to expand...
Click to collapse
In the past month on which I own the device I maybe had one or two random reboots. All stock only rooted. So my guess is its in the advance kernel. Since most people who have it have a unlocked bootloader
Did I help? Then please don't forget to press the thanks button.
Is your question solved? Then mark your question solved in your title.
Sent from my Xperia T using XDA Premium.
I haven't experienced any restarts but my battery level indicator is a bit hit and miss.
I can run my batt down to, say, 5% then turn the screen off and leave it for a while and it'll report something like 15% when I turn the screen back on several minutes later. It will also stay working for AGES when at 1% - my best effort was just under an hour of video with 1% being reported!
I'm sure it'll all get fixed in an update. The T is much more stable than my G-Note was just after release, it took months for Samsung to sort things out on it!
Not random reboots nor battery level issues. Currently in fw 195.
The first 2 weeks of my tx, it could stay at 100% for several hours even over night.
After that, It could stay at 1% for up to 3 hours. Lol
The indicator is not Accurate, but hey, I got pretty good battery life out of TX, around 30hrs per charge.
As for the battery indicator: the percentage is calculated based on the current the battery puts out. The problem with current batteries is, if you pull a lot of energy in a short amount of time (boot/reboot, play game, other hard phone use) the current temporarily drops and thus a wrong percentage is calculated. After a while, the current recovers and the correct value will be shown. Comparable to the fuel gauge showing less/more fuel when parked at a steep hill.
This explains how the meter can fluctuate. What I cant answer is if your phone acts inside the "tolerance margin" or if its way off. My Galaxy Note recently went from 30% to 5% in a couple minutes (I used the hell out of it...) and after I stopped using it, it went back to 15% overthe following 30 mimutes.
As for the other issue, I obviously cant help as I dont possess a X T.
Gesendet von meinem ASUS Transformer Pad TF300TG mit Tapatalk 2
So far battery life seems insane with the extended standby mode... Haven't run a full day yet but it's barely dropping at all for the last couple hours.
Sony T restart problems
Hey guys,
Just looking at sony website, i searched xperia t and in the tutorial it said that holding the power off button turns the phone off while holding the power off button and volume up button at the same time makes it restart. All you guys saying you've got problems with the device re-booting. ITS NOT THE DEVICE ITS YOU PRESSING THE VOLUME UP BUTTON:silly: . A little research never hurts every once in a while!!!!!!!!!!
Noticed the battery percentage peculiarities too... Can't we hide the battery percentage altogether? It makes me anxious.
Had only 1 reboot on the other hand, while going into airplane mode. Phone is pretty stable (build 223).
I was having the same problem + some. Got a replacement TL and it behaves normally Read this post, http://forum.xda-developers.com/showthread.php?t=2355862 if it sounds familiar get a replacement ASAP
gpgon said:
I was having the same problem + some. Got a replacement TL and it behaves normally Read this post, http://forum.xda-developers.com/showthread.php?t=2355862 if it sounds familiar get a replacement ASAP
Click to expand...
Click to collapse
That's 3 VERY old threads you have dug up, can I ask the reason why you are doing so?

[Q] Samsung Galaxy Note critical battery life after 4.1.2 update

Hello!
I know that there were a lot said about battery problems in 4.1.2 android, but i still haven't found any solution on my problem. My Note was bought with GB 2.3.6 and had an awesome battery, but after i updated it to JB 4.1.2 (via Kies), suddenly battery life is catastrophic. I have everything off (bluetooth, wi-fi, gps), my screen brightness is on minimum, i use my phone on GSM band (not 4g), i also disabled some of unused apps, etc...everything said was also my practice on previous version 2.3.6 and phone battery lasts up to 4 days, but now, it drains off in 17hrs and I barely use my phone!
If I check battery stats, it shows that screen is the major consumer of battery and it seems like it is on all the time, although the phone screen is physically off most of the time. It means something causing my phone being awake all the time instead of being off.
Any ideas how to fix this??
ajvek8558 said:
Hello!
I know that there were a lot said about battery problems in 4.1.2 android, but i still haven't found any solution on my problem. My Note was bought with GB 2.3.6 and had an awesome battery, but after i updated it to JB 4.1.2 (via Kies), suddenly battery life is catastrophic. I have everything off (bluetooth, wi-fi, gps), my screen brightness is on minimum, i use my phone on GSM band (not 4g), i also disabled some of unused apps, etc...everything said was also my practice on previous version 2.3.6 and phone battery lasts up to 4 days, but now, it drains off in 17hrs and I barely use my phone!
If I check battery stats, it shows that screen is the major consumer of battery and it seems like it is on all the time, although the phone screen is physically off most of the time. It means something causing my phone being awake all the time instead of being off.
Any ideas how to fix this??
Click to expand...
Click to collapse
4 days? really? think that is unheard of. Either how, it should last longer than 17 hours.
Try going back to factory settings, perhaps theres something running thats divided by zero :silly: .
If you feel adventurous you can also choose to root & try a custom rom. Though thats your responsibility and choice entirely.
Anthropostar said:
4 days? really? think that is unheard of. Either how, it should last longer than 17 hours.
Try going back to factory settings, perhaps theres something running thats divided by zero :silly: .
If you feel adventurous you can also choose to root & try a custom rom. Though thats your responsibility and choice entirely.
Click to expand...
Click to collapse
Yup 4 days, not kiddin...4 days of average use.
I forgot to mention that i already did the factory reset and i also wipe the cache partition in recovery menu... I disabled practically everything, and i use things when i need, nothing is set on auto, sync or anything. Last night I didn't touch the phone for about 9 hrs and battery consumption was around 1% which is ok, but it's draining everytime i turn on the screen like 5% in 10mins. BBS shows that well known GTALK_ASYNC_CONN as a battery eater. Is it possible to kill this annoying thing on un-rooted phone???

[Q] [SUPPORT][BATTERY]Battery drain or Software problem?

I own a Samsung galaxy S advance for the past two years now.
Still on Gingerbread 2.3.6. India unrooted. Past 3 weeks I was visiting USA.
I was using a AT&T Go-phone there.
What happened is my phone always switched off while I was using it. Just like THAT! I was thinking because I was using WhatsApp on this phone, I thought maybe cause I have a different number for WA and so WA was continuously trying to identify the number whenever I was on-line.
Specifically, the battery used to drain from 75 or 63 or 47 % right down to 4 %!!!. And when plugged in, in off state, the battery used to get charged to full within seconds (the indicator showed full 100%). After I switched it on, the phone again switched off. This happened quiet a few times and so when I returned to India, I uninstalled WA reset my phone, formatted the USB storage and used a few apps to recalibrate and determine the "health" of the battery. Also I noted the time for it to switch off. I was around 2 and a Half hours which means actually the battery drain and switching off randomly continued even after factory reset.
Now here are the questions
1)Has the battery gone beyond its life or is there a problem with the software or is there some bug that is killing the battery? Just a small note here, the battery is kinda swollen
2)Also, what should I do, buy a new battery or install new software (custom ROM or something else) depending upon the ROOT cause from the above question.
Please help.
Thanks indeed.
God Bless
~amol
amolpravar said:
I own a Samsung galaxy S advance for the past two years now.
Still on Gingerbread 2.3.6. India unrooted. Past 3 weeks I was visiting USA.
I was using a AT&T Go-phone there.
What happened is my phone always switched off while I was using it. Just like THAT! I was thinking because I was using WhatsApp on this phone, I thought maybe cause I have a different number for WA and so WA was continuously trying to identify the number whenever I was on-line.
Specifically, the battery used to drain from 75 or 63 or 47 % right down to 4 %!!!. And when plugged in, in off state, the battery used to get charged to full within seconds (the indicator showed full 100%). After I switched it on, the phone again switched off. This happened quiet a few times and so when I returned to India, I uninstalled WA reset my phone, formatted the USB storage and used a few apps to recalibrate and determine the "health" of the battery. Also I noted the time for it to switch off. I was around 2 and a Half hours which means actually the battery drain and switching off randomly continued even after factory reset.
Now here are the questions
1)Has the battery gone beyond its life or is there a problem with the software or is there some bug that is killing the battery? Just a small note here, the battery is kinda swollen
2)Also, what should I do, buy a new battery or install new software (custom ROM or something else) depending upon the ROOT cause from the above question.
Please help.
Thanks indeed.
God Bless
~amol
Click to expand...
Click to collapse
Seems like a battery problem. I read that it has about 500 charge cycle. And 2 yearsh has more than 500 days...
New observation
shut_down said:
Seems like a battery problem. I read that it has about 500 charge cycle. And 2 yearsh has more than 500 days...
Click to expand...
Click to collapse
Thanks for the prompt reply,
Yesterday, I charged the battery (phone) and I didnt install WhatsApp. I left the phone in flight mode and just let it out for "idling".
For a good 7 hrs it was as it is and then I installed WA and bang! switched off.
Do you reckon that, the application uses a lot of juice so much so that the remaining battery dies off instantly? (now that the battery is in bad "health")
~amol
amolpravar said:
Thanks for the prompt reply,
Yesterday, I charged the battery (phone) and I didnt install WhatsApp. I left the phone in flight mode and just let it out for "idling".
For a good 7 hrs it was as it is and then I installed WA and bang! switched off.
Do you reckon that, the application uses a lot of juice so much so that the remaining battery dies off instantly? (now that the battery is in bad "health")
~amol
Click to expand...
Click to collapse
Indicator probably shows non correct value. Or it shows, but battery is so weak now that little consumption of energy drains it that much...
Thanks
shut_down said:
Indicator probably shows non correct value. Or it shows, but battery is so weak now that little consumption of energy drains it that much...
Click to expand...
Click to collapse
Thanks shut_down . May be I'll just a buy a new battery and see if that works better for me.
Otherwise it's a new phone for me
Thanks indeed
~amol

Battery issue and restoring completely to stock

Hello everyone,
I have been using a Xperia Z1 for around last 6 months and updated to Lollipop 5.1.1 two months ago. Everything was fine until last week when my phone started to get affected by the battery bug.
The phone works fine and the battery gets discharged in leaps. For example, when I use the phone from 100%, it goes down in the usual way, let's say for 1 hour usage it drops up to 90% which is quite normal. But, when lock the screen and keep it idle for sometime and when I take it back, the battery has dropped a leap, usually by 10-15%.
Yesterday, I was using the phone normally and kept it idle for the entire night and battery has been dropped only from 85% to 79% without stamina mode. That's good. However, when I restarted the phone in the morning, the battery suddenly dropped to 18%. :crying:
I tried calibrating the battery, charging/discharging cycles and removing batterystats.bin. But, the issue is still here.
I think my phone has been affected by the famous Xperia battery bug in Lollipop which means that my battery is damaged. But, before replacing the battery is there anything else that I could do to overcome the issue. Any suggestions are greatly appreciated.
+ My phone is rooted on stock 5.1.1 (14.6.A.0.368) with XZDualRecovery and locked bootloader. If I repair the phone with PCC will it cause any harm or bricking since because of the customer recovery?
Claiming warranty is out of option since the phone has been rooted and flashed with custom recovery.
I don't know why people call it a lollipop bug. There will be a time a battery reaches its end of live. That's what has hit you right now. Your descripte symptoms are from a dying battery. I have seen some dying battery's from me or friends. The battery was holding the charge normally and suddenly no more.
Replace it and all should be fine again.
motorazrv3 said:
I don't know why people call it a lollipop bug. There will be a time a battery reaches its end of live. That's what has hit you right now. Your descripte symptoms are from a dying battery. I have seen some dying battery's from me or friends. The battery was holding the charge normally and suddenly no more.
Replace it and all should be fine again.
Click to expand...
Click to collapse
But, can this happen on a phone that is just 7 months old? Thats what makes me to think that this could be a bug.
I have the same issue, but mine drops to 0% and after waiting some time and booting it the percentage is back up. I have my phone for 2 years now, and the problem appeared in Lollipop also.
aquaboy11 said:
I have the same issue, but mine drops to 0% and after waiting some time and booting it the percentage is back up. I have my phone for 2 years now, and the problem appeared in Lollipop also.
Click to expand...
Click to collapse
It's okay for a 2 year old phone as Lithium batteries wear out with time. In my case, it's kinda disappointing...
So, after searching the entire Internet, I can understand that this is a common issue with Xperia Z1 and Z1 compact and replacing the battery seems to be the only possible solution. I searched EBay for a battery but couldn't choose a good quality one. Can someone guide me on this please?
UnlimitedBB said:
So, after searching the entire Internet, I can understand that this is a common issue with Xperia Z1 and Z1 compact and replacing the battery seems to be the only possible solution. I searched EBay for a battery but couldn't choose a good quality one. Can someone guide me on this please?
Click to expand...
Click to collapse
Your battery is definitely dying and it has nothing to do with roms. Get a battery that the seller claims to be OEM. That's your best bet...
optimumpro said:
Your battery is definitely dying and it has nothing to do with roms. Get a battery that the seller claims to be OEM. That's your best bet...
Click to expand...
Click to collapse
Thanks for the tip. So, I searched for an OEM battery and ordered it along with some tools required for the disassembling. I will keep posted once I replace the battery.
UnlimitedBB said:
Thanks for the tip. So, I searched for an OEM battery and ordered it along with some tools required for the disassembling. I will keep posted once I replace the battery.
Click to expand...
Click to collapse
Don't think that it will resolve your problem.
I changed my internal battery about one month ago and when two weeks passed I started to experiment the same bug ? again
It's not only hardware problem, it also software problem, I believe.
D_Vovan_238 said:
Don't think that it will resolve your problem.
I changed my internal battery about one month ago and when two weeks passed I started to experiment the same bug again
It's not only hardware problem, it also software problem, I believe.
Click to expand...
Click to collapse
You are correct becouse I experience som drops in the range of 5-20% in less than a minute and once 30%. All the time while the phone was in standby mode except once where it did it right in my face (10%). My battery status is reported being fine. I also forced shutdown the phone as per the calibration method for non-rooted phones. Though I did notice dalvik cache wasn't rebuilt and so there is no way to have it refreshed manually except system updates which does this.
Anyway I did remove some apps and did some changes and after this I have not had any sudden drop for weeks. Two of the apps where Truecaller and Facebook official app. Will check though if it was a third one to. I believe one of these or both where playing havok. Especially the Facebook app as it takes liberties I find suspicious, is buggy, can crash the kernel (any app that can do that is doing shady work IMO) and had the addition of a "Video Player" service that was running permanently after you launch the FB app once. I instead use Metal for Facebook now. Pretty much same experience, only 10MB RAM used instead of 90MB and no batter y drain either or any other problem. So in short I believe one of these where the culprits and since many use the FB app that might be the one playing badly with Sony Z1 system.
And If you use Adguard also check if there are apps getting high ratio of ads blocked (or analytics data blocked). Might be some dont get proccessed right in the battery system due to it calculating it wrong. Google Frameworks, Google Contacts, Play Services, Mobilestorage Checker and a few more I disabled the ad filtering for. Though this did not change the battery drop problem previously. It only went away when I uninstalled named apps above.

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