My Quake 4 keeps crashing. The screen will flicker sometimes beforehand, and then the screen will usually become scrambled and then the game just plain shuts down. No error messages or anything, it just disappears without a trace. I updated to the latest patch 1.05 or something like that, and it helped a little; I can play longer now. It still crashes though. It almost seems GPU related to me but everything else runs flawlessly, just Quake 4 is the only thing that crashes.