So this has happened twice in the past four days. The first time I was video chatting, and my fans started to get very loud. I check iStat and I see that one of the fans was at 0 RPM? Within 2 minutes, the fans got back to their normal volume and I check on iStat again, and the same fan that was at 0 RPM a 2 minutes ago was now at the normal rpm (2000.) The same thing happened a few minutes ago when I was doing Photoshop. What is going on here?