While throwing darts, drinking beer, and listening to tunes in the garage, I was surprised when - very occasionally - the amplifier would suddenly increase in volume to the point I would have to run over and manually turn it back down. It was puzzling. I had assumed some neighborhood interference was causing this behavior.
That is, until I was watching television with my daughter, and she picked up the old remote to turn up the volume. I have since relocated the remote to the garage.