Hey, I just found out that power strips need to be changed annually bc the triac in most of them goes bad or at least wears out! That may be part of the problem. Spyder robotics recommends that their thermostats get plugged directly into the wall and not into a power strip. Idk about the Ranco thermostats but double check your owners manual for that particular differential. I had a problem with my thermostat and just got some info here when I posed the question.![]()