A thermostat is the brain of the refrigerator that controls the temperature. If your refrigerator is over freezing then there could be a bad thermostatic temperature controller. In such a case, the refrigerator runs continuously. You should get this checked by mechanics, get this replaced.
Another reason is if the coil of the refrigerator is dusty or dirty then the compressor needs to works longer to keep the temperature of the refrigerator at freezing temperature. In this case, the refrigerator starts over freezing. You can clean the coil that may solve your problem.
Sometimes we set the temperature of the refrigerator at too low or warmer, this also creates the problem. You should adjust the temperature on average or as per the weather condition.
The refrigerator's door has a gasket, make sure it is properly sealed. If the gasket is not properly sealed then the refrigerator will run continuously and this can cause the freezer section to get over freeze. You should check this properly if it cracked or worn, get a new gasket and replace it.
Make sure you get this checked with a professional mechanics.