Maybe some kind of wireless interference? Front Row will launch wirelessly with a remote. Were you able to re-pair your keyboard, or was it battery-related?
Reminds me of an old television set we had when I was a kid in the 70s. It had this huge remote. Anyway, every once in a while the tv would go on or off by itself. We couldn't figure out why until we started noticing that it tended to happen whenever we heard small aircraft overhead (we lived close to a small airport for private craft). Maybe the two were totally unrelated, but we always though it had something to do with the planes' radios.
Or gremlins.