When I first noticed this problem I had to mess with the oven controls for a long time to get it to go to 350 degrees to cook a frozen pizza.
Then I turned the oven off and started eating the pizza the oven turned itself on to lower oven 170 degrees, so I got up and turned it off a few minutes later it tuned itself to lower oven 170 degrees again.
I then turned the breaker off finished the pizza and went to bed.
Now any button I push on the oven control touch pad turns the lower oven on to 170 degrees. I cant get it to do anything else.