Bug is in at least 3.8 & 3.9
Symptom: audio dropouts & glitches whenever touching controls on the controller, on at least the S4mk3 and D2.
Fix: rename your Traktor Settings.tsi and let Traktor make a fresh one.
Issue has occured for myself and at least one other: https://www.reddit.com/r/traktorpro/comments/14o8zcv/comment/jqf4dns/