My computer now has a mind of it's own...
My home computer has been getting fairly strange lately. To be more specific, the screensave often doesn't come on when it's supposed to, or will be on and without anyone doing anything will turn itself off. I'm not super concerned about burn in on the monitor, and I've run a number of virus & anti-spyware scans without turning anything up so don't think that's necessarily the case. And actually, I don't know if software running will/can disengage the screensaver.
I have a theory (that actually just came to me :)) that there's some sort of interference with my wireless keyboard that is causing the machine to think it's gotten mouse movement or something like that to disengage. Or maybe there's constant earthquakes moving the mouse :)