I was having this issues all mid last week. Phone would shut down and woudl not turn on. I would plug it in to charge and the light would not even come on. I called and complained and they had me do a factory reset. no issues....yet........but they said there is no documented cases of this. It was 3x in one day i had to pull the battery to restart.
stock phone, couple games from amazon appstore.
stock phone, couple games from amazon appstore.