Quoted from benheck:The first shop we rented for the show (and also where I designed AMH coincidentally) had weird stuff too.
Something I didn't even notice until a "ghost hunter" friend of my sister pointed it out. The light that switched on and off the most. There was glue residue on the switch plate. I grabbed a roll of duct tape and sure enough, the size matched. A previous tenant had actually taped the light OFF. So we weren't the first.
Sounds like a potentially dangerous electrical short.