2015 Samsung RS22HDHPNSR/AA has an intermmitent problem in that the ice cream and temp inside gets too warm. Ice cream turns to soup. Problem occurs over the past 3 months but is intermittent. Sometimes ice cream rock solid, other times like soup. Refrigerator fine. Coils are clean, vents inside can pass air, condensor cycles on/off as it seems it should. Door never ajar. Adjusted temp colder-same problem. No ice build up anywhere I can see. Thinking it could be defrost cycle thermostat or timer - but may be controlled by motherboard. Open to suggestions as porblem is not constant.