That happened to me with every Beta except .44
Take Jason's advice and try going up, if not
downgrade to a stable OS, you may have to give
up the bells and whistles
I get the same thing with the CDMA version of 4.5.
If I am watching Youtube I have to make sure my screen doesn't time out on me. If it does I can be sure that it will crash my berry when I click my trackball to light the screen up.
I also found that I can't watch .mov files with 4.5 on my berry. It just makes the screen flash until I either shut down media player or my berry resets on its own.
nah my memory has been fine
it might have been cause i had like nooo signal and it was trying to do too much. cause i did it again with better signal and it was fine