Check to verify whether door and shelves are
in normal position, and whether there is abnormal friction between food packages
and appliance walls.

Listen carefully to detect whether noise comes
from top hinge.

Listen carefully to detect whether noise comes
from middle hinge.

Listen carefully to detect whether noise comes
from bottom hinge.

Use a small brush to add Vaseline to hinge pins
and hinge holes.
Open and close door several times.