My name is Peter. I am a retired field service refrigeration technician.
Good for you. You purchased a simple unit that does not have all of the buzzers and fancy controls that can go wrong.
The normal cycle of your unit is the temperature will rise to 20 degrees above set temperature and then shut down, until you reach 20 degrees below set temperature.
Your problem is you have a bad door seal. Your compressor is running trying to maintain the set temperature.
Ok, lets fix this problem:
1.) There are two screws in the bottom front of your refrigerator.
You want to turn these screws clockwise to raise the front of the refrigerator so it is pitched slightly back. This will assist in maintaining a good seal.
2.) Wet the door gaskets. With a hair dryer and a kitchen spatula, heat the door gaskets up pulling them out with the spatula trying to expand the crushed gasket.
If you have a bad gasket. It is easily replaced , a grooved slot. Pull out the old gasket and insert the new one.
Heat the new gasket in hot water for 30 minutes. Form and expand it with your hair dryer and spatula.
2.) Lets finish the job: After time the door gaskets become crushed and do not maintain a good seal, so you have to recondition them. Inspect the door gasket, are there cracks and worn sections? With a hair dryer and spatula, heat the gasket while using the spatula to expand