Sounds like you have a blockage in cooling unit between 'low temp evaporator' (freezer) and the 'high temp evaporator' (food section)
Band-aid fix........rubber hammer tapping or sander w/o sand paper vibrating on absorber tubes (large slanted tubing)to see IF (BIG IF) you can get flow.
Unfortunately even IF you do it will only be temporary.
Best plan on replacing cooling unit or replacing fridge.
Is it time for your medication or mine?
2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
US NAVY------USS Decatur DDG31