XDJ RR Tempo Fader Problem

Hi, Suddently on one Deck of my XDJ RR the Tempo Fader jumps wildly. When i adjust the Tempo until the middle it Works perfectly (- until 0) but when i Go to the other Side it suddently begins to jump between different BPM and in the endpart of the Fading it Works again perfectly so it feels Like Just one small Part of the Fading is Not working correctly. By the Way: i have the Mixer connected with a Laptop but i also Tried it with only USB and Had the Same Problem. You have an Idea to solve the Problem? Best regards, Henrik