Samsung RF18A5101SG/AA Refrigerator compartment too cold

Refrigerator & Freezer Repair
1

Please make sure to click on General above and select the correct appliance type first.

Brand: Samsung Bottom-Mount Refrigerator
Model Number: RF18A5101SG/AA
Main Symptom: Refrigerator Compartment temperature is below freezing
What happens & when: It varies between 40 degrees F (set temperature) to 15 degrees F at times, causing refrigerated items to freeze.

Error Code (if any): None
Parts or tests already tried: 12 hour defrost
Photos / video link: N/A

I was originally thinking of replacing the temperature sensor OEM21564426, but I figured I’d check here for more guidance.

Thank you in advance, John

2

Too add to the detail, there isn’t any ice build-up in the freezer. The Freezer temperature is reading 10F, but it is set to 0.