The only solution is to replace the control. and yes. I have heard of many where the control is "off" alas never that far off.
Suggested solution is don't use it. Use a counter top oven These big brother to the toaster ovens now offer air frying and other functions that are amazing.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times