My phone randomly shuts itself off. It is charged and it will be at random times. In order to power it back on I have to take the battery out and re-seat it, then it powers up fine and stays on. Anyone else have this happening? Any suggestions? It is a pain in the waaazooo since I use it for my alarm clock! Thank goodness I have an internal body alarm clock that won't let me oversleep.....or hasn't yet!