my refrigerator (MODEL NUMBER: RF28HFEDBSR/AA)is making a loud humming noise and the back center appears to be frozen. I have defrosted it in the last two months which fixed the problem but the issue is back. I have seen NUMEROUS posts about this same issue but am wondering if anyone has had a resolution through Samsung. I noticed there is a current class action for the freezer "freezing" up and requiring defrost to fix. Neither of these issues should happen on a $2500 appliance that is barely 5 years old. Should have stuck with Kenmore! Super disappointed in the product and the response from Samsung customer service.