Game Crash after idle time

[RappsFF7]

After several minutes of being idle (somewhere around 5-10 minutes) the game hard crashes, as in, the game exists with no warning or error message. This problem happens with the game maximized OR minimized, and at any screen (including character creation, grrrrrr).

I have an Asus G50VT laptop with a nVidia 9800 GT mobile video card and 4 gigs of ram, running Vista 64-bit with UAC disabled. My video drivers are up to date for this model of Asus laptops.

Thanks in advance for any advice to solve this problem.