Possible game closing randomly or Vista feature?

I have been playing games on Vista with only a slight performance hit, but
in Warcraft 3 TFT, I had an issue one time where the game simply closed
without warning. I assumed that this was a Windows Vista feature as that
hasn't ever happened to me with WC3/XP. I thought that maybe Vista decided
to close the program because it sensed the video card was being stressed.
It wasn't being stressed actually, but it's a possible explanation and I was
wondering if anyone knows more that could help me out.

Does anyone know if Vista monitors/samples to see if the software is
affecting the hardware adversely? I know this might have been a random
fault/error, too.

Thanks.

Simon
http://sberube.net/