ours does the same thing. Ice builds up behind the panel on the back wall and the fan starts hitting it making the noise. Repairman I called took back inside panel off and defrosted the big block of ice that had built up. Fridge was 3.5 years old at time. Now we have to defrost it at least once a year. Samsung appears to be no help. To me, this is definitely a design/defect. I've had refrigerators for 50 years and never had a problem like this all the time.
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