By luck, it didn’t do it when I reset the breaker, while the microwave door was open. Only when I closed the door. I found an article on the forum with similar characteristics, suggesting one of the microswitches in the door had failed. For this model Bosch, there are two … I ordered both and began to remove countless screws, to get at it … not so hard, really, three sheet metal covers was enough to get to the assembly. The parts arrived quickly, and the microwave was back in place 30 minutes.