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it sounds as if you have a problem with the defrost heater.
It may have a faulty defrost thermostat or defrost timer
The defrost timer is supposed to come on once every 24 hours for about 30 minutes, ( Depending on the fridge) to defrost any ice build up that may be starting to occur. If it malfunctions this can occur.
You may need a hands on tech to test these components to see if one of these are faulty.
Iam sorry but I stand corrected. Your problem may not be as I suspected.
I am sorry but I do not have the information you require. I will opt out and another expert may be able to assist you. Sorry for the inconvenience.
Thanks for your input guys just to clarify you stand by the first enties claiming it was probably a Defrost heater can you clarify