Problem with my steinberg UR22 mkII

I have a problem with my sound card, every time I turn the sound up or down it gives me noise, I’ve tried it on other computers and the same thing with the sound card, I’ve had it for 2 years
I have the UR22 mkII sound card

Might just be oxide in the pot, try turning it back and forward 50 times or so and it will probably be ok. If not there are lubricant free cleaners for electronic equipmant that can be used.