Why does dorm size refrigerator need to be unplugged and plugged back in every 24 hours.?

I bought a NuCool dorm fridge---no coolant, no compressor. I read reviews---some said it was great---some it didn't cool. Mine cooled great for 3-4 days. I checked it over the weekend--it was 65 degrees and the fans were not blowing. I unplugged it and plugged it back in---it seemed to work---the next morning---it stopped again. I took it to a different home and plugged it in--to make sure it wasn't my dorm electrical problem ---the next morning---about 24 hours later---it stopped again---. It appeared to be about 45-50 degrees so I figured it had recently stopped---fans not blowing and no interior light. I unplugged it and plugged it in---it works fine all day.--but stops after 24 hours. Any ideas? I plan to return it this weekend if I can't figure it out.