My zte grand x max keeps shutting off. It will vibrate and display the white screen with the phone name like its going to turn on but doesn't. It will just go from that screen to black for a long time. And when it does turn on its on for about 10 to 15 minutes then shuts off again. And the screen then flickrs. I didn't drop it or anything for it to do this. It just started doing it itself. I've tried leaving it off for some time and restarting doesn't do anything either. I don't know what to do.