It sounds like a temperature sensor problem. On my RF265AABP model there is a control board located under a cover on the back of the refrigerator. There is a wiring diagram on that cover. Remove the cover if you have one, and locate the control board and power supply boards. If you have a voltmeter, check for +5V and +12V (on my model anyway) from the power supply board. If that is OK, then check the voltages on the temperature sensor wires. Mine are at the bottom of the board as shown in the photo. I have 5 temperature sensors, refrigerator (R), freezer (F), refrigerator defrost (R-DEF), freezer defrost (F-DEF), and Pantry (a temperature controlled drawer in the refrigerator). You may need to refer to your specific diagram to get the colors of wires, but it appears that the voltages should be somewhere between about 2 to 4 volts from each sensor to ground. I had a broken ice maker wire that resulted in a high reading, about 4.3 volts on the freezer sensor, so I assume high reading indicate an open sensor, and low reading indicate a shorted sensor. I am not sure where the refrigerator sensor is located. Repairing the broken wire restored the display to normal readings.
On my model the left gray wire is common, and the diagram should indicate color and a letter or so (R, F, R-DEF, F-DEF, Pantry) on my model.