Welcome to our world. Unfortunately, because the problem was not solved during the warranty as the loudest noise was intermittent the tech was unable to solve the issue. We have a KitchenAid. Fast forward four years and although we have pinpointed where the noise is coming from, it is a spinning metal part, we think it is a design flaw. In fact we have had issues with all our Kitchen Aid appliances. Our oven door fell off when I opened it one day! The wheels on the top rack of the dishwasher broke off. Again, a design flaw as now the wheels are made of metal. The microwave had an issue too one day when it was opened. The metal piece above the door just popped off.
Good luck to you, but don't keep the fridge. Every night the house gets quiet as it should, and then you hear that fridge making those sounds.
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