That is really really weird. I have no idea if this is related, but we used to have an older TV, and it began to switch the channels and turn itself off randomly, (and other very odd things). We found out that about the same time it started was when our next-door-neighbor bought a new TV and put it in a room in his house that was at the absolute closest point to the TV room in our house. We realized that his remote was so powerful, (and it was on the same signal as ours?) that his remote control was controlling our TV. Your thing could possibly be something like that.