Norcold pilot light wont stay lit
Refrigerator is Norcold model N611
Heater element is model N61X
Propane tank is full and open.
Burner assembly is clean.
Pilot will start and stay on for about 30 seconds. While on the flame looks good. At the 30 second mark I can hear a popping noise coming from the propane regulator (not sure of its real name but it's the part that restricts propane flow) before the flame goes out.
Any help in diagnosing this problem would be greatly appreciated.