I think it is the phone in the Kaiser that drains the battery.
NOTE that this is NOT about using the built in funtions too much, please read the conditions of this test.
First of all, I am not a typical Kaiser user - the sim card I am using at the moment doesn't support 3G or any fancy functions - just domestic calls and sms!
I think it has been some weeks where I had this problem, but I am not really sure. But here is what I did to test, read it closely:
Kaiser is started from cold last evening, no apps started, nothing running. It has been charged to 100%, and before going to bed, I disable the only thing I have running - the phone! No bluetooth, wireless, nothing at all. I press the power button briefly to put the phone to sleep, right after pulling the charger plug.
All night, the phone is sitting in flight mode, without charger, and in the morning I wake it up and check the battery. 100% it says. Then I turn the phone on (3G is selected off, I have the modified version of comm manager where 3G is included). I check the battery again, 100%, and then mobile signal strength, there are 4 bars, plenty of signal. Then I briefly press the power button to turn off the display.
Time is 0800, phone is on, display off, and I leave it on the table in the same place where the mobile signal was 4 bars. I remove the battery cover, just to be able to monitor the battery temperature during this test. Room temperature is regulated to 23 deg C, and the phone is not exposed to sunlight.
This is what happened:
Phone on glass table, no bag, battery cover removed, 23 deg constant temp, no sunlight
0800: 100% Phone is turned on via Comm Manager, 3G deactivated
0815: 96% slightly warm battery, can just barely feel the battery is a little warmer around the middle, but it is definately warm from battery.
0930: 83% battery still warm
1007: 78% warm battery
1105: 68% still warm - checking the phone signal, still 4 bars
1312: Green light flashes like every other second, but I cannot turn the phone on. Not even sliding the keyboard open wakes it up. I remove the battery and then put it back in place, and turn on the phone.
1313: The phone has booted, battery is now 16%! That is why it did not want to wake up again ...
I connect the charger, checking SMS and phone list. No calls or messages.
So, from 0800 to 1313, just over 5 hours, the phone went from 100% to 16%, with NO USE AT ALL except the phone in standby. Compare that to being all night in the same state, EXCEPT with the phone off.
If it is not something with the phone itself, it MUST be something related pretty close to it.
Some users only have "normal" battery problems because they use the phone with too many functions. As this is obviously NOT the problem here, spare these comments (your phone is OK then). This s... is serious!
------------------------
I urge others who have battery frain problems on the Kaiser to do the same test. Most should be able to do this on - say - a saturday evening (the following day should be one where you don't need your phone too much, and where you don't expect people to call or text you too much).
BATTERY DRAIN TEST:
1. Make sure phone is charged to 100%
2. Reboot and don't start any apps
3. Check no apps running, kill any that started by themselves
4. Turn off everything in comm manager (flight mode, basically)
5. Power off the display, and leave overnight, CHARGER DISCONNECTED.
6. When you get up in the morning, turn it on (should still be in standby with display off)
7. Check battery level and note the time and the phone signal strenght
8. Turn on the phone in the comm manager, nothing else
9. Press the power button briefly to bring turn the screen off
10. Every hour or so, note turn the display on and note the battery level and confirm that the phone signal is still OK
Mine lasted just about 5 hours like this, how long does YOUR Kaiser last???
---------------
Mods, I think this one is important enough for a sticky, please.
Until the problem is resolved, at least.
Thank you
LGB said:
Mods, I think this one is important enough for a sticky, please.
Until the problem is resolved, at least.
Thank you
Click to expand...
Click to collapse
LGB,
from your description I do not see why you are pointing at the phone, of all things. Maybe you just installed an application which keeps your phone from getting some rest in standby.
During my tests as shown in the thread "HTC models with GPS? Excessive standby battery drain CONFIRMED - FAQ added" I used two different OS (WM6 and WM6.1). In both cases I did not install anything except for a GPS tool (tried HTC's GPSTool, Chartcross GPSTest and OziExplorer, to exclude potential application specific trouble) which was sufficient to reproduce the problem. I do not know whether you went that far, but I am afraid you have to follow the same procedure. Before doing so you can try to locate an unusual process running in the background, using TaskManager (one which can show you the processes as well). There may be an "Anti social application", as someone else has put it.
If you find out the exact circumstances, I will be happy to add this to the first page of the abovementioned sticky thread. To me this all seems too much related to each other. It is well possible that the HTC has several sensible spots concerning standby current consumption, and of course I would like to see the complete picture. Best result being one common reason... lets try to nail down this sucker.
BusterTyTN
More than often I go to university and leave Kaiser only with the phone function (GSM, no 3G), no apps running, except for HTC Home Plugin and Pocket Contacts. If nothing happens, like receiving/sending SMS or phone calls, after about 7 hours its at 92/94%. And my carrier doesn't have a good signal there.
LGB said:
Mods, I think this one is important enough for a sticky, please.
Until the problem is resolved, at least.
Thank you
Click to expand...
Click to collapse
ever thought it might be your radio version?
Just a thought guys, but isn't it better to also state some detailed information like :
- ROM version
- Radio version
- SN of battery (there could be a bad batch of batteries around)
- Name of provider
Here's my details, but I haven't got this problem (I can easily run 1 week with battery with quite a lot of Wifi use) :
- ROM : Dutty 6.1 WWE
- Radio : 1.64.06.04
- SN of battery : DCOX17BM003309
- Name of Provider Orange NL
Why don`t you just try a full backup, format yer phone and do the test again?
Doing such test with alot installed is no point.
For my part: My Kaiser is brand new and I am impressed by the batterylife. None of my kaiser-equipped friends have this problem eighter.
Start your phone from scrach. I`m sure the problem will dissappear.
If not it should be under warranty and you should get a replacement.
No phones gets drained by itself while in standby, and if it does its something wrong with it.
speedme said:
Just a thought guys, but isn't it better to also state some detailed information like :
- ROM version
- Radio version
- SN of battery (there could be a bad batch of batteries around)
- Name of provider
Here's my details, but I haven't got this problem (I can easily run 1 week with battery with quite a lot of Wifi use) :
- ROM : Dutty 6.1 WWE
- Radio : 1.64.06.04
- SN of battery : DCOX17BM003309
- Name of Provider Orange NL
Click to expand...
Click to collapse
1 WEEK! hmmmm something smells fishy..............
I have been experiencing a lot more battery drain since using radio version: 1.64.08.21 from 1.27.12.11. But my previous radio version does not work for Sleuth's WM6.1 V3.0. Do you think having a bigger pool size can contribute to power drain also?
LGB said:
I think it is the phone in the Kaiser that drains the battery.
Phone on glass table, no bag, battery cover removed, 23 deg constant temp, no sunlight
0800: 100% Phone is turned on via Comm Manager, 3G deactivated
0815: 96% slightly warm battery, can just barely feel the battery is a little warmer around the middle, but it is definately warm from battery.
0930: 83% battery still warm
1007: 78% warm battery
1105: 68% still warm - checking the phone signal, still 4 bars
1312: Green light flashes like every other second, but I cannot turn the phone on. Not even sliding the keyboard open wakes it up. I remove the battery and then put it back in place, and turn on the phone.
1313: The phone has booted, battery is now 16%! That is why it did not want to wake up again ...
I connect the charger, checking SMS and phone list. No calls or messages.
So, from 0800 to 1313, just over 5 hours, the phone went from 100% to 16%, with NO USE AT ALL except the phone in standby. Compare that to being all night in the same state, EXCEPT with the phone off.
Click to expand...
Click to collapse
Install Batterystatus and tell us what mA power drain your getting.
Battery drain of this magnitude could be a short circuit, causing the heat. Get a replacement if under warranty.
rgds
stuart
I have my Tytn II for 2 months now, but I'm still waiting on my service provider switch, and as it is locked I can't use phone function yet.
BUT, even without phone and with normal daily usage (some gaming, some WiFi, calendar, etc.) I have to recharge every other day. Furthermore I'm experiencing massive battery drain even at standby mode (guess it runs out 20% overnight, doing absolutely nothing!). I always check my task manager and clear any running programs.. I run Batti, which is the only program that's always running I can think of..
jym04 said:
More than often I go to university and leave Kaiser only with the phone function (GSM, no 3G), no apps running, except for HTC Home Plugin and Pocket Contacts. If nothing happens, like receiving/sending SMS or phone calls, after about 7 hours its at 92/94%. And my carrier doesn't have a good signal there.
Click to expand...
Click to collapse
This is how it USED to be for me ... I don't know when, but at a certain stage, that CHANGED. Now, I can get 5 hours only, like that. When I check TASK MANAGER, all I have running are these two apps:
SMS / MMS
Comm Manager
ROM 1.56.403.4 09/19/07
Radio version: 1.27.12.11
Protocol version: 22.45.88.07H
Advanced configuration tool v 1.1 by Schap's:
OS: Microsoft Windows CE 5.2.1620 (Info says build 18125.0.4.2)
.NET Compact Framework: 2.0.7045.0
Glyph cache: 8192
File system cache: Auto
File system filter cache: 0
Phone: Everything is ticked, meaning Show video dialer, SIM contacts, Band page, PIN2 page, Time Zones page, TTY page, ENABLE DTMF support, EDGE Icon, HSDPA icon, Disable SMS sent notification
GPRS/3G disconnect and timer ticked, connection always on is NOT ticked, Disconnect GPRS/3G after 600 seconds (but I haven't used either for a long time now)
Com manager has button 10 as 3G so I can disconnect it
SYSTEM INFO says:
Windows Mobile 6.0 (WinCE 5.02)
Program memory 38% (38.07/101.4MB)
Storage memory 65% (87.65/135.5MB)
Memory card 89% (5.06/5.7GB)
I also have the tweaks2k2 net installed, could I have changed something by mistake?
But WHY is it that when the phone is off, I get normal battery life, with phone ON it goes down fast, even with no use?
I did a new test this morning, this is what I did:
Phone charged 100% in the evening. Flight mode all night with screen off. In the morning it was 99%, and this is what I did:
0648:99% GPS on (GPSTuner, very basic GPS program, just to keep it alive), lowest setting on the display. GPS came on pretty quick, and I kept poking the display now and then to keep it out of standby
0728:66% (GPS and display still on, behind shielded windoes so DOP only between 5 and 25, GPS working to try to hold position!)
0827:29%
0910:10% 3xbeep, battery warning
So, with the display on lowest setting but constantly on and GPS running also, I got 2:22 from 99% to 10%, no other items enabled (no phone, bluetooth, wireless etc)
...
my batt
i have had my tilt since late dec? its been dropped lots of times ( yah i know its bad) i have upgraded to the new att fw( just realy havent looked @ new roms)
i did flash a new splash screen i got a good umts signel where i live. if i charge my phone adn then go home and go to sleep with maybe a few apps running when i wake up @ night( i work nights) my phone normally is around 85 to 90% on the batt. my batt sn is 5fga279v007664
r=1.27.14.09
g= 22.45.8807h
d=1.62.00.00
idk about yall i do lots of txtin adn web access adn i normally go to sleep around 12ish pm then wake up around 7 or 8 pm and my phone normally will last 2ish days
Discovered today that even though comm manager said 3g off if I went into connections and opened up hsdpa it was on. Was wondering why my battery was draining so damn fast. Not quite at your speed but quickly.
If I was you I would grab abcpowermeter and also SKTOOLS and use them, they will show drain and the FULL list of procs running and which ones are chewing up the cpu.
hmm lemme try seeing if it lasts abit longer when its on gsm only..im going to have to wait till tue because i work in a call center and the gsm interference irritates the crap outta me and my customers.
ok this post seems to be nothing but n00bs posting which is not a bad thing! thank you for coming out and posting! The radio is a HUGE factor!! probably the biggest one of them all, the new Niki radios seem to be doing the best as far as battery goes these days! Also make sure if your going to be doing battery tests its after a HARD RESET! no apps installed period, I know batti is a big drain on the battery even though its a small app lol.... My kaiser will last about 35 hours with MY use now everyones use is different so there is no perfect judge of battery use, even the battery test apps have a % that it is off by and veryone uses there phone different, But if your only getting 5-6 hours something is wrong or you ARE a heavy user sorry to say! remember the radio is the key to battery use here folks and also the apps you have installed!
ALSO- HSDPA is a battery drain as is UTMS to is you can go EDGE only and you will be ahocked at how much longer it lasts
Programs
austinsnyc said:
ok this post seems to be nothing but n00bs posting which is not a bad thing! thank you for coming out and posting! The radio is a HUGE factor!! probably the biggest one of them all, the new Niki radios seem to be doing the best as far as battery goes these days! Also make sure if your going to be doing battery tests its after a HARD RESET! no apps installed period, I know batti is a big drain on the battery even though its a small app lol.... My kaiser will last about 35 hours with MY use now everyones use is different so there is no perfect judge of battery use, even the battery test apps have a % that it is off by and veryone uses there phone different, But if your only getting 5-6 hours something is wrong or you ARE a heavy user sorry to say! remember the radio is the key to battery use here folks and also the apps you have installed!
ALSO- HSDPA is a battery drain as is UTMS to is you can go EDGE only and you will be ahocked at how much longer it lasts
Click to expand...
Click to collapse
It is obviously because of a program or programs installed that drain the Batt.
austinsnyc said:
ok this post seems to be nothing but n00bs posting which is not a bad thing! thank you for coming out and posting! The radio is a HUGE factor!! probably the biggest one of them all, the new Niki radios seem to be doing the best as far as battery goes these days! Also make sure if your going to be doing battery tests its after a HARD RESET! no apps installed period, I know batti is a big drain on the battery even though its a small app lol.... My kaiser will last about 35 hours with MY use now everyones use is different so there is no perfect judge of battery use, even the battery test apps have a % that it is off by and veryone uses there phone different, But if your only getting 5-6 hours something is wrong or you ARE a heavy user sorry to say! remember the radio is the key to battery use here folks and also the apps you have installed!
ALSO- HSDPA is a battery drain as is UTMS to is you can go EDGE only and you will be ahocked at how much longer it lasts
Click to expand...
Click to collapse
i know umts/hsdpa do have an major effect on batt life....on my old 8125 it would last 3-4 days and but at that time i did not have the data plan i just had unlimeted txtin....and i would use the phone alot in in the morning and alot after school. i also did use wifi alot b4 and after school but none the less it still would last 3-4 days. when i got the tilt i was dissapointed with the life of my of the tilt and even now it still lasts about 2ish days with the oem batt.
Sorry but my TyTN II does not discharge like that at all.
This has definitely go something to do with rom version, service provider etc etc.
I charge my TyTN II to 100% at around 20h00. By 08h00 the next morning my phone is on 94% with nothing disabled except bluetooth, which I then switch on when I drive off.
There are some apps like Cyberon Voice command and Windows Mobile Voice Command which I have since removed, which do consume enormous amounts of power even on standby.
My TyTN II details:
ROM version: 1.56.421.1
ROM Date: 26th October 2007
Radio Version: 1.27.15.32
Protocol Version: 22.51.88.13H
Service Provider/Network: Vodacom South Africa
i use edge only, new niki radio, push activated, 60-70mins of voice a day, 50-60 txts a day and i can get to 2.5+ days with 4% left, screen brightness is the 3rd notch from left.
the first week i had this it worked great, battery lasted maybe 3 days with minimal use. now with minimal use the battery is unpredictable. sometimes i'll charge it fully at maybe 10 am for example, not use it much at all, then by the time i wake up the next morning its dead. sometimes its even drained faster than that, wifi, bluetooth are not on, no programs running. sometimes i find that its very hot for no reason at all. i'm wondering if i need to take this back to the shop for repair---or if its something i dont; know about that i'm doing wrong? thanks for the help.
Do a search about RLOD in this forum. You will find some answers about this issue.
I notice my battery drains and the back of my phone get hot when I use the GPS. Maybe an application that you ran in the past is leaving the GPS connection open?
Have you tried a Hard Reset?
Just a thought
i don;t use gps, never had, probably never will since women cannot drive in ksa. as for a running program thats open, maybe but how can i find out which is open? according to my device nothing is open.
yeah i recently had that issue too, still investigating it.
So far im investigating:
-AE Button Plus
-Microsoft Voice Command 1.6
-Spb Mobile Shell 2.1
ever since i installed those, its been getting really hot during standby, and wakes up dead in the morning
Had the same problem. Hard reset solved it, it came back after installing my software again. I think it's S2U2, gave errors sometimes and wrecked my sound.
ekw said:
and wakes up dead in the morning
Click to expand...
Click to collapse
This happened to me the other day... Drained dead...........
Have not found reason yet!
I found out what was causing my issue a day ago, maybe related to yours too.
It turns out, AE button plus (when using a button to toggle wifi on aka wifitrigger) still stays connected even though u put the device to sleep. Wheras normally it would disconnect and try to reconnect on wake. However when you manually turn on wifi, instead of using ae button plus' wifi trigger allowed it to go back on its normal behavior.
AE Button WIFI on Standby
Yes, I noticed that the AE Button plus keeps WIFI on, even when on standby... Actually, even if I do it the normal way now, it stays on on standby, unless I change the setting back/forth in Kaisertweak...
Then when I run AE Button plus again, it messed up again.
Have you heard of a solution (one solution is to use another program to turn on/off WIFI ? I just emailed the author.
XXKL3
At the time I turned off the wifi thats when I stopped using the phone. About 54% battery when I went to sleep and about 7hrs later 1% left.
Your device did not enter into a deep sleep due to some program still running actively in the background. You should use another battery usage tracker for better tracking on specific applications that are running in the background causing the drain.
I should have a bar on the awake portion right ?
EarlZ said:
I should have a bar on the awake portion right ?
Click to expand...
Click to collapse
Not sure what you meant. Background sync and many applications are classified under Android System so there is no way to tell who is the culprit.
My own usage stops at the part where Awake and screen of bars stop, if an app was keeping the phone awake, I should have a bar on the awake section and none on the screen.
Hi,
This issue is familiar with me. So in wifi settings you have a special option which can be bring up by pressing the menu key which is left from the home button and there is a menu special or something.. and there you can turn on to switch off the wifi when the screen is locked! and do NOT forget to SAVE your changes by menu button!!
Hope this will help u
This issue seems to be going on and off but now its back again.
4hrs since unplugged dropped to about 92%
Just to be fair, it does show that in 4 hours you have used your screen, so much so that it's the 2nd thing on the list. I'm still playing with my SGN but on my SGS2 my screen is always #1 or #2, depending if I use it a lot or a little that day. And Android OS is always #1 or #2 as well. I'd say in 4 hours, 92%, that equates to 2% an hour, which isn't bad, while still turning on your screen every once and a while. At that rate you'll go over 2 days (50 hours), which is pretty good as I recall.
I forgot to take a snap on the screen time, it only has less than 7mins of usage.
So here's the deal. Wasn't getting great idle drain but figured I'd give it a while to see if it worked itself out. It hasn't. Took my phone off the charger and slept for less than 8 ours and loss almost 16% about 2% per hour.
I had wifi on. Blue tooth off. gps off. i have greenify stopping my voicemail and facebook app. I have about 60 something apps frozen. Android OS took up most of my battery life as you can see in pictures. Went to partial wakelocks and saw email at 30seconds but there are only like 45 secs of partial wakelocks so not that big of a deal. Noticed that better battery stats said my phone was awake for almost an hour (I was on it for 10 minutes looking at stuff which is why the screen on pic saus about 10 minutes, the screen wasn't on at all from unplug to me waking up). Noticed under kernal lock that something was keeping stuff on for almost an hour.
So why on earth was my phone on for almost an hour of the 8 hours i was asleep? Further, why does my battery drain look like it was pretty consistent over that time even though the phone was on for an hour. It makes me think that it continuously must be turning itself back on. I know that wifi is the problem for some people but I figured that I would be able to see that in partial wakelocks yet it isn't there. I can try changing wifi stuff if some sees something showing that it is wifi issues.
Otherwise, maybe i should return the phone???
So , I would say that the main issue is your mail service process. It woke up 184 times, every time it wakes its going to keep the phone awake for a little before the phone completely goes back to sleep. it is work related i assume?
anotherfiz said:
So , I would say that the main issue is your mail service process. It woke up 184 times, every time it wakes its going to keep the phone awake for a little before the phone completely goes back to sleep. it is work related i assume?
Click to expand...
Click to collapse
yes that mail account is work and there is an account for my school. It is the email apk that bypasses security that plenty of other people are running. Do you think that it is an account issue or the Email.apk? So the 180 wake ups only totaled for 30 something seconds of partial wakelock. Is it not showing upas a partial wakelock and that is why the phone says that it was on for so long?
also, I read that something having to do with wifi and the qcom_rx_wakelock cause severe battery drain. Know anything about that.
So, yes, the app only worked for 33 seconds because each wakelock probably required only a few milliseconds to do what it needed to do.. but the phone does not go to sleep instantly after each wakelock. so for each of the 184 times that app woke your phone up, it was "awake" for 5-15 seconds or however long it takes the phone to decide its time to go to sleep again. Awake time for me is almost always a function of screen time, like 1.5x - 2x my screen time.
anotherfiz said:
So, yes, the app only worked for 33 seconds because each wakelock probably required only a few milliseconds to do what it needed to do.. but the phone does not go to sleep instantly after each wakelock. so for each of the 184 times that app woke your phone up, it was "awake" for 5-15 seconds or however long it takes the phone to decide its time to go to sleep again. Awake time for me is almost always a function of screen time, like 1.5x - 2x my screen time.
Click to expand...
Click to collapse
so any idea on a solution besides setting up for my email to only check every half hour. It is set to push right now. Given I don't need it at night really and i can set something up to change when it is allowed to check for emails. But sometimes I am up at 2 because I get an email that requires me to do work. Also, the qcom_rx_wakelock that kept m phone on for 32 minutes or something doesn't seem to have to do with the email. But maybe when the email tries to access the internet that wakelock runs to try to get wifi...
edit: I did more research on the qcom_rx_wakelock. I still don't understand it all but it is some issue that the 4.2.2 update came with. It causes major battery drain on some wifi networks and not on some others. It has to do with the wifi connection continuously having to talk to the router and waking the phone up which is also tied to some apps that are syncing. People on nexus's have created patches that fix the issue, but I don't think I'm going to be doing anything like that. I PMd a member to try and get more information.
For now I have two routers at my house and will be switching to using the other router for my wifi connection on my phone to see if it creates the same battery draining issues while in sleep. If I get any more information I will update again. I also think this could explain a lot of the reason that some people are experiencing sub-par battery life while others are getting great battery life. Depending on what router (work, school, home, public place) you are on might make the phone constantly turn itself on and off trying to reconnect or do something with that wifi network. I know many people have had 15 to 20% battery drain overnight then turned wifi off and just stayed on 3g/4g connection and battery drain went to 4 to 5% over night. FYI
I just got the Moto X and have a few things installed. My question is, in the battery mete graph you have screen on and awake. Is the awake always supposed to be on? I'm guessing it is since it has the touchless controls always listening.
Figured why it won't go to sleep. Has anyone ever had it where the phone app gets stuck and stays awake? Only way to get rid of it for me is to reboot.
I have the phone for a week now and more and more it's shut down when I want to switch it on. I then have to press the power button a bit longer and it will then restart normally.
And there is something else that I think is strange (I just found out while testing because of the other issue). When I press the power button multiple times then sometimes it doesn't switch on again. After a wait of a few seconds and another press it switches on again.
Anyone else has these issues? Can I track why it switches off? Is there a log to see what happend before?
Only when it's cold
I noticed that the random shutdowns are not so random. It only happens when the phone is cold. I can put it 3-4 minutes outside (a bit below 0 degrees celsius) and it switches off every time.
When it's warm - it never happens.
Anyone else have this problem? what's the temperature range which it should work in? I never had that with another phone and it's really not that cold.
Not me, but it's not that cold here.
But it is coldest time since i have z3c and i noticed that in camera when switching from superior auto to manual, or anything it lags a bit when it's cold.
I couldn't find operating range for our battery but it looks like that most Li-Po batteries suffer when temps go below the 0C
I'm going to assume that's your case.
Standby phone = no heat being generated = available current dropping = phone shutting down
Info
chaelli said:
I noticed that the random shutdowns are not so random. It only happens when the phone is cold. I can put it 3-4 minutes outside (a bit below 0 degrees celsius) and it switches off every time.
When it's warm - it never happens.
Anyone else have this problem? what's the temperature range which it should work in? I never had that with another phone and it's really not that cold.
Click to expand...
Click to collapse
weird
thr s always process in background so the phone temp will be always above 0 C
unless the environment temp be too below 0C (like -20C)
contact service center and tell the story and please inform us here what s their response
:good:
Thanks for the inputs. I know that there is a limit on lower temperature for the batteries. But as I easily was able to restart the phone and it showed no strange value for the battery-power, I don't think it can be only this. Also - we had 5 other phones with us and they all worked in the same environment. I'll keep you posted what the service center answers...
I have been in low-temperature environments(-18,+4,0 C) I did not stay too long, but phone survived without any hassle
I am having a very similar issue. Since day 1, my phone randomly reboots especially during the night every 20 minutes or so, and i usually find it switched off in the morning when i wake up. I even had to go work late the first morning because I use the alarm of the phone to wake up and since the phone was switched off, the alarm didn't work.
Last week i went to ski. Up in the mountain, the phone was almost completely useless ( Tempererature was just below 0 C ). It was constantly rebooting in my pocket and shutting down every 5 minutes. Whenever i wanted to use it, the screen opened and as i unlocked the phone it rebooted, however if i continue to use it afterwards ( opened mobile data and gps, talking, etc. ), it did not reboot. So i thought that it might be due to battery getting too cold. Also, i realized the rebooting happens more frequently when i put the phone in a very low power usage state like Ultra Stamina or flight mode. ( I also put the phone in flight mode during the night when i go to sleep )
I have contacted Xperia Care. They assumed this might be a software malfunction and suggested resetting my phone using PC Companion. I played along and reset my phone but it didn't fix anything. I will call them again tomorrow. I am suspecting the battery itself is faulty or the background task that is supposed to heat up the battery is not working properly.
Update: : Appaerently the phone was in fact faulty. They changed it with a new one which is working pretty fine