Gabomda If it cools a little below where the thermostat bulb is placed, that is why it does not cut, the causes can be: lack of refrigerant due to possible leakage, which are very common these failures in those refrigerators of the calls of 2 cold, 2 evaporators, one above and the other below, as the pipe or pipe is completely covered, it is very difficult to discover the leak, the other could be partial plugging of the filter, very remote that this is the fault, or the last one that the compressor lacks already in performance, and these three possible failures you would have to review trained personnel, greetings