Samsung rf268abrs forgets temperature setting

Brand: Samsung
Model Number: RF268ABRS
Main Symptom: Fridge will show on display it is at the correct temperature but fridge and freezer both are warm.
What happens & when: The fridge will work okay for a couple of days but at some point even though the display shows 38 F/-2 F the fridge and freezer will both gradually rise in temp to the 50s and higher. After a power cycle the display will show the correct temperature in both fridge and freezer, and after period will cool back down to the set temperature. A day or two later the same process will occur again. I’m guessing a control board may be the problem, any idea which one?

Error Code (if any):
Parts or tests already tried:
Photos / video link:

The main control board DA41-00620C holds the cooling logic.

https://www.appliancepartspros.com/samsung-assy-pcb-main-da41-00620c-ap4564715.html