Originally Posted by ma2hewyu2b
Never installed anything different
Everything is from Google like i mentioned earlier. I'm a simple guy who uses only FB and Instagram along with Yelp and Yahoo Mail
And I never rooted my phone once.
Well then the only other thing it could possibly be is... KARMA or to be more precise... BAD KARMA! LOL just kidding!
Actually it's possible that you could open an email or go to a web page that has some type of virus that causes the rebooting. This would happen on a new phone too if you receive the same email or go to the same web page.
Good luck finding any other suggestions.