kitchenaid thermostat

i replaced the thermostat about a year ago because the ref would just ‘die’ for no reason. i used to be able to reset it by powering off using the thermostat until i can no longer reset it that way. that’s when i replaced the thermostat. now i’m encountering the same problem! what makes the thermostat break?

could it be the microwave that is plugged to the other outlet where the ref is plugged?