Does a door rattle when another is opened or closed?
Door can rattle due to air pressure inside (cool air circulation).
Refrigerator is designed so that air can circulate
between the freezer and the refrigerator compartment.
Therefore closing the refrigerator door with a strong force can make the freezer door rattle.
How to fix
The phenomenon is normal, not a defect of the product.
Low adherence of rubber gasket can also cause door to rattle. Clean the rubber gasket.
If the problem persists, level the product so that it inclines slightly to the back.