Very loud throbbing / flapping noise, can be temporarily stopped by turning fridge temp. up. Sounds like a fan problem. I've read that ice can accumulate in the fan of some GE refrigerators / freezers causing similar noise problems. Certainly our freezer doesn't take long to grow frost everywhere - could it have something to do with this? Would defrosting the entire unit and hooking it back up help, or would it just be another temporary fix?