[Q] Random reboot and bootloop issue
Having some issues with my S3, bought in November 2012 and worked perfectly fine until a few months ago when it started turning off and rebooting, it would get to the initial 'Samsung Galaxy SIII' logo and loop on that until the battery is pulled. It'd work fine for a few moments after it booted to the lockscreen and then do it again.
I got it working again after I left the battery out for several hours, afterwards its been working fine apart from the occasional turning off, looping on the inital boot logo. Fixes itself first try so I've been happy to live with it if it only does it occasionally.
So about 20 minutes ago it turned off and looped. No worries, pulled battery out for a few minutes, put it back in and turned it off. Usually it would work absolutely fine after this, but instead it kept looping. Got a bit concerned, so pulled battery out for a few minutes, put it back in and it worked. Then it did it again, so battery pulled out for a few minutes, put back in and it works fine. I've had it charging since it started working and it seems to be going fine now (could be just a weird superstition of mine, charging it seems to keep it alive?).
I can usually tell when I'm using it if its about to reboot, if I go to lock the screen using the power button, it acts as if I long pressed the button (power options appears). So I use the back key to get out of it and try locking it again. Does the same thing and then it reboots within a few seconds. Could be power button getting stuck?
Adding music/data to the device does seem to flare this issue up for a little bit, but those could be completely unrelated
Factory reset fixes it for a little but that isn't possible all the time of course.
Any suggestions on how to fix or prevent this issue? Is it the sudden death syndrome flaring up? I'm on 4.1.2 XXEMG4, the latest for the region of the phone, so the sudden death fix is incorporated.
EDIT: Found the solution to the problem today. Seems that the issue is the power button sticking. I verified on my mothers s3 that holding the power button down does reboot the phone, by skipping the whole shutdown sequence and going straight to the bootup. It seems that because the power button is sticking, the boot sequence isn't able to complete so it will reboot endlessly.
Try pulling the battery out, and firmly (but not so firm it will break) and repeatedly press the power button around 10-15 times. The video I saw suggested smacking the side of the phone against a hard surface but that may be a little extreme. Anytime the power menu comes up when you go to lock the screen, quickly press the power button heaps of times until it locks and you will avoid a reboot