Hello- I have a beverage air MT-12 glass door cooler in my basement. When i purchased it used, it was not cooling. I had a professional replace the compressor, and it now cools to 38 degrees. I have noticed however, that the compressor and condenser fan turn on approximately every five minutes, and runs for about 30 seconds. Is this normal, given that its more of a commercial glass door cooler designed to be opened frequently? Or is there something wrong with it, perhaps the thermostat? It does this even on the warmest setting. Any advice would be appreciated! Thanks!