Condensation forming on the freezer wall

Condensation is usually a result of humidity entering into the refrigerator.
 
Please check the following:

■ Ensure that door is not obstructed by any item placed inside refrigerator when closing.

■ Check the door gaskets by closing the door and ensuring they are sitting flat on the cabinet surface. If any deformation (wave) or a split if found, a replacement will be recommended. 

■ Ensure food (especially large containers) are not stacked and are not blocking the air vents. This will result in poor cold air circulation in some areas of the storage compartment.