I have been having problems every so often when I put my PB to sleep, it completely seems like it dies(the sleep light dies and no amount of input activity will wake it)....but i guess it doesn't cause when I press the power button, it doesn't start up...i have to hold it in and do a hard restart to get it to come back on....has anyone else had this problem, and is there a fix for it....PLEASE TELL ME THERE IS!