I have a Fridgidaire side-by-side refrigerator/freezer. About six weeks ago it just stopped cooling on both sides, freezer and refrigerator. Ice melted and ran out on the floor, frozen stuff thawed, the works. After a few hours it came back on and operated normally, working fine until the next episode. Since then this has happened two more times. It's about 5-6 years old but we've only had it about a year and this is the first time it's started doing this. Any ideas before I call the repairman?