We also have had the fan noise issue since shortly after the unit was installed. We had the Ice maker service performed and that slowed down the ice maker freeze up issue but did not resolve it.  The fan noise was present from near the start of the purchase. I searched the web and found many people complained about how loud these units are so we thought that is the way they are. After the ice maker service the unit was very quiet. Over the next month the unit fan noise became increasingly loud again. We  searched and found the Forced Defrost mode and have been using that ever since. Over the years, we have to run the Forced Defrost mode three to four times in a row to get the fan noise to stop, but it only takes a few weeks for the fan noise to return. Finally, we learned to watch for signs of ice build up by looking at the air circulation vents in the refrigerator rear cooling panel. When ice appears in those holes or on the outside of the panel, we run the Forced Defrost several times. I tried slowly increasing the temp of the fridge from the recommended 38 to 40 and then 42 and nothing solves the issue long term. Sony taught me never to trust their products and Samsung has done the same. No further purchases from me or my family.  ... View more