Hi. In those types of failures, I would look at the electronic board, because you say it turns on for a minute and then turns off. I would disconnect the transformer and instead place a lamp of relatively low consumption. It would also disconnect the plate and fan motor, in order to work only on the controller board and thus isolate the faults. It may be a software problem or some electronic component, or there may be more consumption in any of the different accessories (motor, fan, microwave stage) and the microphone gives the Stop command as protection. Regards