I think that is normal. Ours does it too. When you open the freezer, you let warm air in, when you close the door, that warm air quickly cools and contracts causing a negative pressure in the freezer. With ours, it is almost impossible to open the freezer door for 30 seconds or so, until the pressures equalize. Actually, I would take it as a good sign, it means that your freezer is airtight.
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