Hi, welcome to Just answer
Please tell me its complete model number
How old is it
Oven door is opening freely as earlier
OK, seems you are not here....as everything else is working fine the problem seems to be with the thermostat that is bad and will need replacement...you will have to check the thermostat for continuity...no continuity means it should be replaced, if it tests fine then you will have to check the timer control
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Yes this cleaning function uses extensive heat to clean the unit and that is why the thermostat seems to have gone bad
How good are you DIY skills ? Can you test the thermostat with a multimeter ?