Phone restarting nonstop My phone started rebooting all by itself all the time after I did 2 things with it. Installed Snapdragon BatteryGuru and put it on learning mode (for an estimated 3 days I guess) so that I could start saving battery by the app learning my behavior, and cleaned RAM with CleanMaster. These were the only changes I've done, I don't remember which was first but soon my phone started rebooting whether I was handling it or not at random intervals.

I've also noticed the phone was hot all the time, the Note 3 runs into some hot period with some frequency but not with that frequency. I've uninstalled both apps and it didn't work, wiped cache and it didn't work. The phone was still rebooting even on safe mode. After I wiped Dalvik with the help of TWRP, I thought the problem went away but when I hit the power button to turn the screen off, the phone rebooted and it will now always reboot when the screen turns off, even if it's just from the phone being inactive. It doesn't boot-loops, it just reboots, then after a random time, can be seconds, can be half an hour, it will reboot again. Note 3 SM-N9003 VJUBMI6.
Solution 1

This may be a dumb question but have you tried a factory restore?

I had the same issue happen on my HTC Inspire a long time ago.  Even after I uninstalled an app, the random reboots would still happen.  It wasn't until I did a factory restore did the issue finally go away.

Not sure what exactly in the factory restore would have fixed the issue for me, but you may want to give that a shot.

Solution 2

Have you uninstalled the Snapdragon BatteryGuru? I know you uninstalled CleanMaster. The battery running hot could be due to BatteryGuru running the phone at MAX (fastest possible processor speed, etc) and causes the overheating.  Internal safeguards then causes the phone to shut down or reboot.