I have a GE refrigerator/freezer. The frezer stopped defrosting. The freezer usually stays frozen but the fridge will either freeze my food (after I use the blowdryer on the freezer) or it won't hold the temp. Any suggestions? It isn't that old. Thanks so much!

It is usually in the defrost circuit.
Timmer
Heater
Defrost termination thermostat. When I serviced them I just replaced all 3 parts.