got my 6800 ultra

woot! i got my 6800...had back order on gigabytes 6800 ultra; but i couldn't wait any longer and went for an evga 6800 ultra. seems to be great so far except for one problem.... i got MOH: pacific assault for christmas and it plays fine at the highest settings. but it randomly locks in the game...like it freezes up and my sound gets stuck on a repeat and most the time after about 10-30 seconds it comes out of it. this only happens ever so often. my temps are ok. i have the latest patch for MOH. I need some help. I also downloaded firmware updates for the vid card from evga about issues with the 6800 ultra cards sticking and freezing but this did not solve the problem.