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The thermostat is broken( check if you ever hear it stop running). or if freezing is only on a local spot like on a corner on the backplate then you have a gas shortage( compressor is running a lot more and longer than normal.but it stops once a wile.
This often happens when the evaporator freezes up. The freezing temp is not normal and the frost sensor causes an error code. You should open the unit and clean the evap and condensor thoroughly. Let it thaw out if its frozen with ice. Drain the unit. Clean the evap thoroughly. Reasemble and run in fan mode to let the unit dry out. This should fix it 90% of the time. Rarely there will be an actual problem with the sensor in the rear of the unit, you can check the wires leading to the sensor when you have it open for cleaning - sometimes they will be broken when you remove and replace the filter.
Your baffle that controls the freezer temperature is possibly broken. If you take the cover off the dials labeled "refrigerator/freezer" the baffle is a plastic arm that controls the amount of air circulation between the freezer and the refigerator. If the arm is broken is will stay closed completely blocking the air hole or vent. I just wedged a small piece of wood or shim in mine and it hasn't frozen up since.
Good Luck. I know how frustrating it can be to repeatedly defrost the ice build-up.