BFG Tech 6800 GT Overheating?

[Kilmer]

I've had my BFG Tech 6800 GT for a few months now and never had any problems with this one until recently while playing games, every now and then my screen will scramble up with weird colors going every where and I can still talk on Ventrilo or do other things, but can't see anything or get it to go back without rebooting. Is it possibly my video card overheating? I know they are OC'd out of the box, but I haven't messed with it in regards to overclocking aside from that. Or is the card possibly going bad yet again? (this is the replacement they sent me from the first going bad)

 

[7718]

maybe the thermal paste/pad is going bad, if your going to have to send it back anyways why not remove the cooling and reapply some thermal paste? Although that might void your warranty so you might not want to do that.