The food side of this GE side by side will get warm. The damper door will be closed.The freezer is cold and making ice etc. If I pull the power and replug it in the damper door will open and the food side will get cool again,but after a few hours will become hot and door closed again. I have replaced the main board and the thermistor in the food side with no luck. Is this the damper door failing? Or am I missing something? Thanks