Long story made short.
A friend Carla, 73, turned into driveway and noticed light in upper BR. Light went off. Called 911. Police found nothing. Home secure. Same thing about a week later. Also has found light on in A.M.
A friend and I checked practically every connection in the house. We removed switches, recpts, etc and checked connections. Put recording voltmeter on incoming. Found no problem at any point.
Carla believed it was her dead husband’s ghost. Very frightened.
Ed and I borrowed an infra red video camera w/a motion activator and set it in the upper BR.
We got the culprit on tape. It was Carla’s cat. Removed the P&S Decora and installed a standard toggle. Problem solved.
Rowdy