Sorry, I'd need a bit more detail to understand the issue as the CDJ and DDJ are two different platforms (stand alone vs. controller).
CDJ-2000NXS2 & DDJ-400: Random changes in volume
Yesterday, I used my USB with CDJ-2000NXS2's and towards the end of a couple of hours, we noticed that the volume was changing seemingly at random with no change in trim. We thought this might be the CDJ's, but now at home, I'm having the same issues with my DDJ-400's.
Does anyone know what causes this and if there are any fixes to it?
I think they are definitely two separate issues that just coincidentally happened on the same day.
The DDJ-400 issue seems to be related to an audio driver issue in Windows 10, causing random volume level changes. I have fixed this.
With the CDJ's, we used these at a hire venue and have used the same ones at a later date with no issues. I assume the fix for these (if they were to continue to happen) would be tohave them maintained by Pioneer themselves, but I think both problems have sorted themselves out.