I have no explanation.
Came home yesterday to find the dinghy at the top of the boom. Short in the cables controlling the winch? Don’t think so – everything seemed to be working fine. Both controllers were still tucked under the canvas of the dinghy where I keep them safe from the rain. It would have been tough for someone to mess with the boat and then replace the controls as they were. No harm seemed to have been done. I pulled the cables out, returned the boat to its position, disabled the fuse which controls the winch/boom system to prevent further recurrence of this event, secured the dinghy with a new ratchet (the old one had corroded badly, thus the reason it wasn’t secured in the first place ~ which I think was good, as being restrained might have burned out the winch motor) and pondered.
I have no explanation at all. Just weird.