this afternoon at your suggestion i put in a thermometer. It stayed around -6 all afternoon and then suddenly it stopped cooling and went up to 58 degrees.The inside of the freezer walls are wet, the icemaker is turned off. I am monitoring to see how long before it starts to cool down again. It does this every day, sometimes twice.
That info about moisture on the walls changes the water leak theory. The defrost thermostat prevents the defrost heater from overheating the freezer during the defrost cycle. It cuts the heater off at a certain temp. If its not working it will start melting ice and items in the freezer until the timer turn the heater off at the end of the cycle. It is located on the tubes behind the back panel of the freezer. You may can tell it's bad by observing weather or not the plug connectors or the thermostat is burned. The thermostat should show continuity when its cold but not when its warm.
I had changed the Defrost Thermostat and tried again. It still had cycles of complete thawing where it would go up to 60+ degrees. I then changed both Thermistors and since then it is working fine, this has been a couple weeks now.