Thank you for reaching out to us here in order to find out what's causing your Samsung Galaxy A53's rattling noise. Similar to our dear Samsung members' replies, don't worry, your phone is just fine.
On the inside of the Galaxy mobile phone, there is a component that functions as OIS (Optical Image Stabilization) and minimizes shaking when taking pictures with the camera. If this small part is shaken while the camera is not operating, it may hit the internal structure and make a slight rattling sound.
The OIS (Optical Image Stabilization) is a function that detects hand shaking and corrects the lens by moving the lens in the opposite direction of the shake. Due to the different OIS (Optical Image Stabilization) sizes for each product, the sound may be relatively loud depending on the product. This is due to the characteristics of the OIS (Optical Image Stabilization) and it is not a product defect. The sound does not affect the function or performance of the mobile phone.
Samsung's OIS (Optical Image Stabilization) uses a combination of hardware and software processing that's advanced enough to deliver clear and sharp photos even in low light thanks to the big sensor on the Galaxy S and Note series. The multi-camera system offers dual OIS (Optical Image Stabilization) for steady shots, whether you're using the wide-angle or the telephoto camera. So, at almost any time of day, your photos will come out as vividly as you remember the moment.
For more assistance and guidance, you may contact us via our online Samsung Customer Care support channels below.