Hi,
I'm having a similar problem. In fact, my current TNT2 video card works just fine, except the game randomly crashes after a few minutes: screen is frozen. I tried lots of different things, used the latest drivers, directX, upgraded BIOS, etc. but it's still the same. Or is it that another device (mouse? screen?) has a problem?
The video card works more or less otherwise, although I experienced the same problem with other 3D games and another display problem running 2D Battleground games. I'm under the impression the card is KIA and I might need to change it.
I have a Celeron 466 on an ASUS P2B-F motherboard, 128MB RAM and a flat screen.