Today the same thing happened though the length of time between state changes got increasingly small.
At somepoint I decided someone else in my building was using x10, and although it was briefly entertaining to think that I was getting to turn their light on and off.
I came up with an extreme solution to this problem, I picked up an x10 filter that was supposed to block interference from computers. I realized if I ran all the x10 controlled stuff off the same powerstrip I could block the rest of the house, and still get to have my computer turn things on and off. (and improve the reliability of the system).
And as an added bonus I need fewer power monitors to track home much electricity I'm using. The down side is I need to be careful to make sure I don't overload the outlet. (Though since I'm monitoring it with my watts up meter, it shouldn't actually be dangerous).