My pc hasn't shut down yet, but several times now, for no apparent reason, my fans, both cpu and gpu have gone into overdrive. System definitely thinks it is overheating. I have an open case design, plenty of airflow and have never had an overheating problem playing any game. System hardly breaks a sweat usually, so I'm not sure what is triggering the problem. When the fans go into overdrive, performance goes down the tubes as well. Serious lag. Usually last less than a minute or until I transition...and then everything is back to normal. It isn't combat or number of enemies triggered. I've been checking my journal in the middle of nowhere on a completely enemy free map, and the fans will trigger. So I'm not sure what is going on yet.