Suggest lowering the refrigerator set point to a lower number such as 3. There is usually an indication of normal setting on the adjustments. Wait 24 hours and check the refrigerator compartment again. Use a thermometer to record the temperatures. The meat compartment will be normal just below freezing. If no success then read the following.
One reason that this occurs is that the unit is working near continuously to reach the freezer temperature. Another words the unit is not capable or cooling the freezer to the prescribed temperature. The result is the excess cooling eventually reaches the refrigerator section causing the refrigerator to freeze. The unit will if this is the case run nearly continuously. This situation is counter intuitive. Freezer not reaching set point, excessive cooling over cools refrigerator therefore refrigerator freezes.
The cause is either the freezer door/seal is not closing or sealing the freezer compartment or the compressor or defrost cycle is not functioning properly.
Check the freezer door seal using a strip of paper. Check to see if air is flowing from the vents in the freezer. Using a thermometer check the temperature of the freezer. Listen for and record if the compressor is running or not.
The normal freezer temperature is around '0' Fahrenheit. If no or little air is flowing from freezer air vents look for ice on the back wall. If ice is present it is likely the auto defrost cycle is not working. Attempt to defrost by hand which requires several hours with everything removed.
Check that lint and dust has not blocked the coils under the unit and that the lower fan is running. Usually warm air exits from the machine grill in the front. Remove the grill and check for air flow and debris buildup. Vacuum if necessary.
And unfortunately if the compressor runs continuously and no air blockage underneath would indicate that the cooling capacity is reduced requiring a major service or replacement.
Hope this helps?