Feel for you Daniel, we had those types of issues with my dad when he got bad. Starting to deal with mom some now.
Mom and Dad had 2 sconce lights in the bathroom with plugs on each one. They both mysteriously lost power to the plugs and bulbs. When I remodeled the bathroom and removed lights, Dad had pulled wires from the fixture, wire nutted them and taped them. We can only assume he was paranoid they would start a fire.
Living with my mom, we are finding stuff in cabinets that have no logical reasons to be put there, at least not our logic, probably perfectly correct to mom.
We found the fire detectors in closets too with dad.