Crossfader problem

I've bought my U-Mix Control Pro (1) about one month ago and today some problem has started.
This movie will show you what i mean. Problem have place also in Cross 2.0 so i think its not software problem.
https://www.youtube.com/watch?v=rmA1cC3aRcQ
*sorry for rotated view in movie
Anyone can help me?
This movie will show you what i mean. Problem have place also in Cross 2.0 so i think its not software problem.
https://www.youtube.com/watch?v=rmA1cC3aRcQ
*sorry for rotated view in movie
Anyone can help me?