When I first got my Radeon 3850, the temp was around 39 c at idle at 50% fan speed. Now, after regularly cleaning dust from it, it averages 55 c at idle at 60% fan speed. Normally this won't bother me much, except that for some reason my computer auto shuts down when temps reach 70c, which is especially annoying while gaming. Would you guys know the solution to this problem?