02 Jun 2010 at 18:54 - 6
Overheating is usually the #1 problem to test for. It doesn't have to be bad fans, it could be a number of other things things. Maybe your computer worked fine at winter, now when it's summer, the sun is shining in on your puter making it harder to keep it cool. maybe you moved your computer inside a cabin or closet to keep it more quiet. With less air curculation, it will quickly become overheated as well.
I would suggest you try run some other graphic intense software and see if it has the same effect so you know it's not something with gw but other software as well.