hey all im having a few problems with my psp it keeps crashing as from today from about 5.30pm i was listening to music on it and "bang" it crashed the screen wen black and it wouldnt turn on or off unless i took the battery out its been hapening for a good ferw hours now i can get a few mins out of it b4 it crashes agen i tried formatting my memory stick and resetting to defaults but still it continues to crash. i recently updated to version 3.50 is this a known fault? and can any 1 help me figure out my problem?

Cheers
Chris