I have an Amana bottom freezer fridge md# ABB222ZDEB every now and then it would shut off, when that happened it would warm up, but then come back on by the next day and get cold again. This has happened maybe 4 times in the last year. 2 days ago it shut down, warmed up, but it's not coming back on this time. I can hear the compressor and fans running. Any idea whats causing this ?