Hello,
I have the similar model, GE GFSS6KKYASS. My first symptom was slow ice production. I then noticed my ice-cream was mushy. This was odd because the freezer temperature reported as -2ºF(I know it is the reading and not the set temperature as I changed the set temperature to confirm.) I bought a thermometer and placed it in the freezer and even thought the refrigerator display reported the temperature was -2ºF the thermometer reported 20ºF. The refrigerator section appears to be working fine and the thermometer reports it is at the set temperature. I then placed the thermometer in my other freezer and it correctly reported 0ºF so I know it is working properly.
You may want to check your freezer temp with a different thermometer as well, since it appears the one (thermistor?) in the freezer may not be correct.
I called a an appliance technician out and he discovered the freezer evaporator coil had an uneven pattern (The top coil was encrusted with ice and the rest had none, I didn't even notice frost) He informed me that I had a sealed system issue and was better off replacing the refrigerator.
I have read this is a telltale symptom of a sealed system failure, but given the odd temperature issue, I was wondering if there is a possibility it is anything else? Also, his initial comment at seeing my refrigerator, "You got one of those fancy ones." made me question his competence.
I'm grasping at straws as I am upset at replacing a refrigerator that's only a few years old
Thanks for any help,
Jay