GE side by side-Fridge is o.k. Freezer goes back and forth

We have a GE profile side by side where the fridge side is fine but the freezer side goes warm for a period of 6 to 7 days and then will freeze properly. The guy from GE said the compressor is bad because it was hot, however, 2 days after he left everything has frozen again in the freezer? Would it freeze again is this was the case. I replaced the board and the defrost thermostat already. Any ideas?