Reason 1: The washing machine is slanting.
Solution: Adjust the washing machine to be even.
Reason 2: The laundries put slantingly in spinning.
Solution: Level the laundries and close the top lid.
Reason 3: Foreign materials such as coins are in the tub.
Solution: Get out the foreign materials.
Reason 4: The lint filter falls off.
Solution: Please re-install the lint filter.
Reason 5: The laundries in the tub are over capacity.
Solution: Reduce the laundries.