Hi and Welcome to Just Answer,
Ok, let's take a look at this;
How long has it been since you cleaned it, if it is still hot it needs about a hour to cool... Let me know the time that has pasted
I also found this in the manual
If you need more help Let me know
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ok, try reseting the factory settings
The control can be reset to the factory default settings. To
return to the default settings:
1. Press and hold upper oven Keep Warm and CANCEL
pads for three seconds. A single beep will sound and 12:00
will appear in the display.
2. Reset the clock to the current time of day.
Unfortunately it sounds like the lock itself is failing, I would suggest that you do have a repairman to look at that, do you have the number for there repairman?
Customer Assistance at 1-800-688-9900
That is not good business.
Sorry I couldn't help you more then what you have already tried