Why does the POCO F7 Ultra make abnormal noise when shaking?

The POCO F7 Ultra features a 50MP main camera with OIS (Optical Image Stabilization) and Autofocus. The camera quality has undergone rigorous reliability inspection, and the phone has also undergone a comprehensive inspection before leaving the factory.
Due to the characteristics of the OIS focus motor, the motor contains movable parts. When the camera is not turned on, the movable parts are in an unfixed state. When the phone is shaken vigorously, the movable parts shake and slightly collide with other parts inside the OIS focus motor, causing an abnormal sound. This phenomenon will not have any negative impact on the performance of the camera, so please feel free to use it.