My iPhone decided to go haywire around three lastnight, at first I just ignored it cause it sounded like a call, (who calls at that time), but it locked up and wouldn't let me hit answer... When i picked up my phone, i noticed it was very hot! I hard reset it, but it just came to the apple for about five seconds and would turn back off.... I had to do two restores to get it to be responsive again, any idea what happened here???