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So first, I want to explain why the temperature go back to the higher settings. After you set the temperature, the display reverts back to showing the ACTUAL temperature inside which is why it keeps showing 11 and 39. The real problem is that the temperature is just too warm.
Now the refrigerator cools by stealing air from the freezer, and the freezer is warming up. The freezer should be 0ºF so it's starting to affect the refrigerator section. Now 11 degrees should be cold enough to keep the refrigerator down to 37 fairly easily which means that there is likely an air flow problem. It sounds like you have a defrost issue that you need to thaw out, but to be certain you'll need to pull everything out of the freezer and remove the back panel inside the freezer. If the silver coils behind this panel are packed with frost, then you need to thaw out all the frost with a hair dryer to get the unit cooling down properly again because you have a defrost issue. Also, if the frost comes back after a couple weeks then you have a bad defrost heater or defrost thermostat or control board that would need to be replaced. Otherwise if the frost doesn't come back then one of the doors was likely just left cracked open too long.
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