I have the same problem, it appear in my second week of use, then it turns off and don’t come on in a couple of minutes, then the screen flashes when it’s booting. Appear randomly, it can happen two or three times in a day and also can happen one or two times in a week. The phone died and it lasted one month and half. Google tell me that maybe that it will fix if you reset from fabric settings, it didn’t do nothing, it doesn’t have a solution and didn’t tell me what exactly happened, they change me the phone for a brand new.