I have a Sanyo SR-3660S mini refrig and I cannot get it to cool anymore. I can plug it in and hear the compressor kick on and I can raise and lower the thermostat inside the frig but no matter what I do it does not get cold. I am not sure if it is the thermostat/controller or the compressor. The compressor sounds like it is on and it appears it is always on since it keeps trying to cool but will not anymore. Asking for suggestions.