What is your room temperature? 80% run time @ 70 degrees,90% @80 degrees and 100% @ 85+ is normal on most refrigerators. Put a container of ice cream in the freezer (not in the door),leave for 12 hours. It should be firm and spoonable (if that's a word) not hard as a rock or too soft. Fans all run when the compressor is on and do not when it is off. The 30 min @ noon was probably in defrost. Temperatures will fluctuate. May be leading to a loss of charge, or compressor issue but without gauges can't go any further.