Please can you help? I own a Samsung SR-S2028CSS Refrigerator/Freezer, which is about 7 years old now. Recently it has started to cut out and defrost. When I turn it off at the mains and turn it back on it starts working again for aprox 12 hours then cuts out! I have taken the back off and cleaned out any excess dust etc however it has continued to cut out after 12 hours or so. Is there anything I can do to stop this or a part I can buy? Any advice would be much appreciated! Thanks, Sean