A fluctuating fridge temperature can be caused by a variety of factors. Here are some common reasons why the temperature of a fridge may keep changing, and how they can be addressed:

1. Thermostat issues: The thermostat, which regulates the temperature of the fridge, can malfunction or become calibrated incorrectly, causing the fridge temperature to fluctuate. If the thermostat is malfunctioning, it may need to be replaced. If the thermostat is calibrated incorrectly, it can be adjusted by a technician or by following the manufacturer’s instructions.
2. Door seals: If the door seals on the fridge are damaged or not properly sealed, cold air can escape and warm air can enter the fridge, causing the temperature to fluctuate. To fix this issue, the door seals can be replaced or cleaned.
3. Overloading: If the fridge is overloaded with food or drinks, it can affect the airflow and cause the temperature to fluctuate. To fix this issue, try removing some of the items from the fridge and leaving enough space for proper airflow.
4. Location: The location of the fridge can also affect its temperature. If the fridge is located in a hot or humid environment, it can cause the temperature to fluctuate. To fix this issue, try moving the fridge to a cooler, less humid location.
5. Defrost cycle: Most fridges have a defrost cycle that helps melt any ice build-up on the coils. During the defrost cycle, the fridge may become warmer than normal. This is a normal occurrence and should not cause any issues.

In conclusion, a fluctuating fridge temperature can be caused by thermostat issues, door seals, overloading, location, and the defrost cycle. To fix a fluctuating fridge temperature, try adjusting the thermostat, replacing or cleaning the door seals, removing items from the fridge to allow proper airflow, moving the fridge to a cooler location, or waiting for the defrost cycle to complete. If the issue persists, it is recommended to consult a professional for further assistance.