I’ve got a Diplomat ADP4810 double oven which is about 3.5 years old. To date I’ve had the internal glass shatter and the fan element fail. Both of these have been replaced and its worked fine until now.
If I switch the fan oven on to say, 200c. It will heat up fine and remain on for around 10 minutes and then the oven switches itself off (no clock/timer).
The only way to resurect it, is to switch it off at the mains and leave it off for around 10 minutes. After that it works long enough to finish cooking the food.
It doesn’t seem to do it all the time though as last night it was on for around 45 mins to cook something and managed fine.