If you notice ice forming on the interior of the fridge, it's a sign that something isn't right. The usual moisture is beginning to freeze, posing a threat to the unit's temperature control. It may potentially result in the appliance's failure. Here are a few reasons why this may be occurring:
Defrost failure.
Bad door seals.
Warm air comes in too often.
Not closing the door all the way.
Drainage issues with bottom drawer freezer.