Help please. I have an unlocked Pre I use in Mexico. It worked great until I upgraded to 1.3.1. Now the phone turns on and off constantly. Even stranger is the fact that when it is charging on the touchstone it stays off or in the normal mode with clock displayed. When I have it charging on direct cable hookup the screen never goes to sleep. I don't want to go back to factory settings as this will re-lock the phone. I have tried moving the battery around but no results.