Hi @cjmitchell,
Since the refrigerator temp is OK and the freezer is still below freezing but just not at what is showing I’m wondering if perhaps outside air is getting into the freezer compartment somehow, a faulty seal somewhere perhaps.
Is there an ice or frost build up around the ice dispenser area by any chance? If so it may be a faulty [https://www.searspartsdirect.com/product/66idujf1dk-0046-363/id-wr17x11653|dispenser ice chute door], [https://www.searspartsdirect.com/model/3fe5d21m4s-000432/ge-gshs6hgdecss-side-by-side-refrigerator-parts|part #62 freezer door parts diagram]. The door flap can disconnect from the dispenser lever or the plastic tabs that hold it in place may break and this allows the outside air to get into the freezer compartment.
You could also check the freezer door seals as well. Place a sheet of paper between the door and the door jamb and try to pull it out with the door closed. It will come out but not that easily and it certainly shouldn’t just fall out by itself. Try this at various places around the door, top, bottom and both sides.