right tempo fader sometimes not working

I work with Traktor Pro 3 hardware and software with a MacBook Pro and sometimes my right tempo fader doesn't work. Moving the hardware fader doesn't have any effect or only small and not predictable effects. Using mouse and software to manipulate the fader is not working properly either. This problem appears sometimes, other times when I start Traktor everything is fine. I thought that this is a hardware problem but if I use Virtuald DJ with the Traktor hardware, I don't have that problem. I tried changing the fader settings from relative to absolute mode, but that didn't solve the issue. How can I tackle this? Thanks a lot for answers.

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