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There are a few things that could be causing your problem.
One of the least likely is the controls themselves are bad. This is rarely the case. They only tell the main control board what you want the refrigerator to do.
The second common failure is with the thermister (the part that reads the temperature) has gone bad and is not reporting the proper temp to the main control board. It is attached to another part that can fail. The air damper is a motorized part that will restrict the airflow coming from the freezer side into the refrigerator side to keep the refrigerator the proper temperature. If it fails to close when told, it will allow continued cold airflow into the fresh food side and cause everything to freeze.
The third and most common failure is the main control board itself. It controls the entire operation of the unit. If it is getting proper readings from the controls and thermisters and not responding properly, it will cause it to freeze up.
These parts range from moderately expensive to very expensive (main control/motherboard). If you would like part numbers for any of these pieces, just let me know.
Hope that helps,
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