Ice buildup on the interior walls and around the door opening.

Safety first: Unplug the freezer before defrosting heavy ice buildup.

Step-by-step checks:

• 1. Inspect gasket: Clean the door gasket with warm soapy water and check for tears or deformation. Replace if it does not contact the cabinet evenly.
• 2. Check door alignment: Ensure the door closes squarely and the hinges are not bent. Adjust hinges if necessary.
• 3. Manual defrost: Turn off and fully defrost the freezer, protecting the floor from water. Do not use sharp tools to remove ice.
• 4. Usage habits: Minimize door opening time and avoid placing hot or uncovered moist food directly into the freezer.