If the noise occurrs at the shutdown of the "condensor fan" its probable caused by the compressor (a broken suspension spring inside). Sice the compressor is a non-repairable item replacement of the compressor is the solution. My advice is keep using the unit until it totally quits and then evaluate repair verus replacement on a cost-effective basis. Almost all units (refrigerators) come with a "sealed system" warranty of 5 - 10 years. Expect a $300 - $400 repair bill.
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