Answer:
Case 1: Arrange food scientifically instead of stuffing too much so that there is space inside for cold air to circulate evenly.
Case 2: Check if the door is closed carefully, if there are any food bags or sacks stuck. Check if the rubber gasket around the freezer door is peeled off or torn.
Case 3: Check if the refrigerator is frosted. If your family's refrigerator often frosts, you need to clean the refrigerator regularly, usually every 6 months.