Wayne -
The other cause, of course, is that the thermocouple has moved a bit, and is no longer bathed in the flame. When the refrigerator cooling at full throttle, the flame is quite big, and a small position error won't cause a problem. But when you turn back the thermostat a bit, the gas cuts back to idling, and the flame becomes quite small. The thermocouple must still be bathed in this small flame. If it is not, CLICK!
Fortunately, of all the problems considered, this is probably the easiest problem to solve - look for the picture in your refrigerator owner's manual.
Bill
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