Our 4 yr old refridgerator. Our 4 yr old refridgerator & freezer quit working. power was

Question

Our 4 yr old refridgerator & freezer quit working. power was on because the temp indicators showed 48 & 28 degrees. Should be 36 and 1 degree. We moved all of the food out and obviously temps were much higher after having doors open for a long time. Fridge was no running or cooling. Then later that night, after about 8 hrs, I checked and temps were back to where they should be, 35 and -1. Any clue as to why this happened?