Question about Logitech MX Master 3S

It sounds very much as if a corner is protruding from one of the pads. You can try to press it back on a little, but this usually doesn't help much or only temporarily. On a good mouse pad, it should glide easily and quietly. You should certainly check whether there is still a protective film on the pads, otherwise I would say: Defective. Lg

I have no such problem.

Is there still film on the sliding pads?

I have and have had various MX 3 and MX 3S mice and have never had any problems with gliding.