My phone has randomly started shutting down by itself and then powers back up. Before everything resets, it shuts back down again. I barely have enough time to power it down by myself so it does not continue to do this. I do not have a sd card in it, but I did take the sim card out and put it back in, I have also tried restarting it in safe mode, but it continues to do it. I have turned it off and left it off for about an hour and it is still doing it. What else can I try?!