The freezer in my side-by-side works fine, but the temperature in the refrigerator side keeps fluxuating. About a year ago, it would sometimes get colder than normal. For the last couple of months, it would drop into the mid 30s and be in the mid 40s the next time I checked. This morning when I got up and checked it, it was 48 degrees after being closed all night. I have it set on the coldest setting, but it doesn't seem to have any effect. Any suggestions?