My Galaxy S2 (Android 4.1.2, phone not rooted) has started turning itself off, even when plugged in and fully charged. To restart the phone I first have to remove and reinsert the battery.
This has happened to me with several batteries, one aftermarket and one new supposedly OEM (with hologram "ORIGINAL" sticker and s/n).
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I got the phone from 3 UK on a contract in July, so phone's pretty new and not rooted or anything.
Yesterday the phone started turning itself off at random times quite a lot.
Battery could have been over 60%, at 30%, it was never with the same charge that it would happen, also never when doing the same thing on the phone.
Usually when it's about to turn itself off, I lose signal completely, then the screen just goes black.
When I try to turn it back on, it usually dies again at the 3 logo or even at the Samsung one and I have to try and turn it back on again. Sometimes I had to pull the battery out and connect it to the charger to make it boot up ok.
After a couple of times it did that, it started going into a bootloop when attempting to turn it back on again after the random shutdown. Phone wasn't hot either.
It had happened a few days before but just once not this many times in one single day.
I removed the microSD card, since it makes the phone think the device has been modified and won't let me update, but the microSD works fine in my old Samsung smartphone and even with that removed, phone still turned itself off and then went into a bootloop.
I think it might be the battery. Last time I was using the phone unplugged yesterday night, the battery went down to 33% charge in less than an hour and phone turned itself off. After managing to make it boot up again and connecting it to the charger, it was saying 60% charge. I doubt it could have gone up to 60% being plugged in just for a minute or so.
So, I can certainly take it back to the store and have them fix it or buy a new battery and see if it solves the problem.
Is it likely to be the battery that's malfunctioning?
Lots of people on the Internet seem to have this problem and a few mention a swollen battery. They replaced the battery and phone was fine after. Mine seems ok, but I can't be sure.
I don't understand why I seem to lose signal completely just before it switches itself off... it doesn't do it all the times, but a lot of the times yes.
I have other phones on 3 and they didn't lose signal completely and anyway in my house coverage has always been excellent.
I forgot to mention that once, while trying to restart the phone, I got this message, more or less: "Installing custom OS can damage your system or applications. Choose volume up to continue...". My phone's not rooted and I haven't installed any custom ROM!
Anyone else deal with this, I will use it like 30 seconds prior, lock the screen and go to pick it up and nothing, I have to pull the battery and reboot. Happens a couple times a month maybe, usually happens when I am actually trying to do something. I am currently running on Nonsensikal 8.8 but it did it on Ivans 1.0 and Nonsensikal 7.5 as well. It may have done it on the stock 2.1 rom as well, but I cannot remember. It seems to happen more often now that it is on Froyo though.
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Anyway, this thing called "Quiet Mode" will randomly turn itself on at nighttime or in the middle of the day with no warning and silence all sounds and block calls from all contacts. This is obviously frustrating. I'm not bumping it in my pocket or anything -- you can't even turn this mode on without unlocking the screen and scrolling all the way over in my top pull-down bar. For instance, it's been sitting on the chair next to me for the last two hours and I just checked it and it's been in Quiet Mode for who knows how long.
I can add contacts to the allowed calls list, but I still won't hear the ring, and I can only add a limited number of contacts. Also, all the writing within this mode is really poor English, which is odd. Example: "Please mind that incoming calls with exactly the same numbers with below list will only be allowed." Anyway, it can be scheduled for certain times and I'm going to try scheduling it for just one minute from 4:00 - 4:01 AM every night and see if that satiate its compulsion to be in control.
Any ways I can keep it from doing this otherwise? It doesn't appear to be an app that I can fiddle with.
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