Electric. When I pulled the auto dryer circuit, it went a week without
stopping so I thought I had it. I've wiggled the door switch and shook
the whole unit looking for loose connections, but could not find any.

Yes, I took the entire dryer apart and cleaned it good. Heating
elements look good. If it raised the temp and that knocked it off, why
can I start it back right away. My experience with thermal switches
are that they take a minute to cool back down (being bi-metalic
switches).

Thanks