You have some odd electrical issues. I don't actually know and am straight up guessing here but I would hope an overload would trip a breaker or fuse. Herpstats are very sensitive to 'dirty' power (need pure seine wave energy) if they are used with anything else they often don't work at all, or look like they are but do not regulate. I wonder if there is some feedback happening? Guessing here. I would talk to Dion, and talk to an electrician. There could be something VERY concerning in the wiring somewhere.