Yes i'm talking about the physical movement of the fader. When I physically move up or down the fader, the sound becomes louder or softer, slowly (sometimes faster than other times).
WHen I turn it from loud to soft it even often (yes often, not always) doesnt even reach zero.
I broke the two middle faders when I first got the thing. Not a hard thing to do unfortunatly. So I went on with the two outer faders, not experiencing any problems whatsoever. Now last time when I wanted to mix I got this problem. In addition sometimes the sound moves down by itself. At both middle faders I can see a tiny metal strip that is out of place.
The weird thing about all this is that after the incident I continued DJing without a problem. Until now. I also tried VDJ where I encountered exactly the same problem. So it must be hardware.