It starts up, runs for about ten minutes, then shuts off, lasts ten minutes, shuts off etc. Last night I was using my laptop on my lap (fancy that, eh?), knees apart so the laptop bottom was able to radiate heat, just browsing, no other apps even open. Fans were running at 5-6000 rpm on and off, on and off, every ten minutes. No rhyme or reason. It's very strange. CPU usage seems to be up at 75-80% during these periods, but the dominant (by far - 90 something %) process is just the quartz-wm Window Manager. Jiggered if I know what's going on.