I watched several YouTube videos about this issue with Samsung fridges. Some of them showed how to do a forced defrost and that should fix it. Some showed how to do forced defrost and add aftermarket heater coils or some sort of heater to the coils, etc. I called my local appliance store where I bought the fridge and asked them about the issue and they said Samsung is taking care of this issue if you call them, and if you can get a response. I researched the parts and found them on AppliancePartsPros.com. Much cheaper and easier than dealing with a service call and repairs. It was easy to do it yourself change out and so far the fridge isn't making any noise, no ice build up and it is cooling very well. Fingers crossed it lasts more than 7 years:-)