Gremlins controlling one light

Hi,
For months and months now the overhead light outside above my front door keeps mysteriously turning on. I cannot for the life of me figure out what is triggering it. I have gone through all of my Triggers and Schedules with no luck. When I examine the log, it does show the switch activating but never gives me any clues as to why. I'm looking at Device Links and see that the light is linked to a couple of Responder Devices that have addresses that do not match any known device in my system. Nevertheless, I cannot delete them. Does anybody have any idea what's going on and how to fix it? It's making me crazy (not to mention costing me money).
Thanks,
Eric

[jay (support)]

Have you factory reset then resynced it? That should reset the links database.