Slow drain in the shower
 

We have a slow drain in the shower and whenever we snake or plunge, we get the sand out it. What can be the issue?
Can it be a break? I think. I heard that the P-trap collects the sands. I don’t know how it happens without a break. I'm planning to check the drain pipe and install a new one if it has any damages. Should I hire any drain cleaning service providers for the camera inspection? Because the camera inspection can

-diagnose the issue in real time.

-identify the problem and locate it accurately

-identify the problem without digging the ground.

What do you guys think about think about this? Any suggestions or advice are appreciated.