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The freezer door almost opens (slighty/half opens) itself for the while during the closing of the refigerator door.

Product name/model: RB305GM3110
This one is normal. The refrigerator and freezer compartments are connected by the air duct. If you are closing the refrigerator (upper) door, the air from the refrigerator chamber is pressing the freezer (bottom) door. It causes a little movement for the freezer door, but the bottom door gasket prevents the freezer door against the opening (freezer door remains closed).