BL Black Out!

Whenever I play on BL's side, and die, I sometimes well most of the time my screen goe's black. I then have to ctrl+alt+del to pop up task manager and switch back to CF and CF pop's back up again in a matter of 3 minutes. but after the third time sometimes the first time CF will just stop responding and I will be kicked off the game all the way back to my desk top.