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Hello, this is Dave and I'm happy to help you. This sounds like a bad air damper door. Can you feel air coming out of the slots at the top of the refrigerator compartment? Is that where you hear the noise?
Do you see frost on the rear wall of the freezer? Since you said you defrosted the refrig and it worked for a while it could be a defrost problem. Any frost on the back wall should be no more thick than you could skim it off with a fingernail.