[RMcNeal]

We were at a private campground in Georgia when we first noticed it. Hooked up on 50 amp service. Progressive EMS says power, ground and wiring all good. It seems once it resets that it runs fine for about 8-12 hours, then it will shut off and not turn back on no matter how hot it gets. As you said, turn it off, then back on, or reset by removing face plate fixed it every time, but only temporarily.
It's a real concern for us since we have 2 English Bulldogs and can't leave them in the rig without being very close by. They can't take the heat down here. I have a camera/thermometer that will alert my cell phone if the temp gets too hot, but I better be close when it does.