Interesting, thanks for explaining the design of the knob.The volume of DX3Pro is not a general volume but a rotary encoder. In the structure inside, many electrodes are printed on the circumference of a disk-shaped insulating substrate, and the rotation angle is detected by rubbing it with a mechanical brush.
Due to its simple structure, the behavior you point out will inevitably occur. It will occur again if you use it even if you replace a new part.
The frequency of occurrence is proportional to the number of times the dial knob is turned.
If you don't like it, use the remote control to operate it.
I know the structure and drawbacks of this part, so I usually operate it with a remote control.