I recently bought doom3 and it looks lush, despite running off an ATI card (yes we all know the great nvidia/ati issue here but i wasn't gonna buy a new graphics card for a damn game) i have managed after some tinkering to get it running pretty smoothly...but there's one problem. at random points during play the game just closes down. just to give you some idea, i haven't even got to the 1st mission yet, so its a fair old problem. usually something like this would relate to a driver issue, but ive got the latest driver for the radeon9000 mobility in my laptop. i've patched the game with the v1.1 too. i don't know what to do.

can anyone please help?