U-Mix Control Pro - Crossfader broken?

Hi everybody!
During the special summer deal I bought a U-Mix Control Pro. I haven't been playing around with it too much, as I am not really djing anymore. But in a week I'll play at a friend's place / club
So I finally set my U-Mix Control Pro up and started to get used to the workflow. It's a great thing...
All of a sudded the crossfader stopped working correctly. I wasn't scratching or anything, so at first I thought I hit some button or entered a certain MIDI shortcut or accidentally changed some settings...
But now I've been checking everything, even looked at the mapping, but the crossfader still won't work again. The fader within the software sometimes moves a little if I play around with the hardware fader, but I'm never able to change to the left player, the software fader will always stick to the right or go just as far as the middle... Also I have to move the fader fast in order to get any reaction from the software fader.
If I move the software fader to the left everything reacts as expected.
Also I tried to set the crossfader to reverse, but this just changes to problem to the other player.
If I move the crossfader fast, I sometimes get two crossfaders within the software (just for seconds though).
Is my crossfader broken?
Thank you for your help!
During the special summer deal I bought a U-Mix Control Pro. I haven't been playing around with it too much, as I am not really djing anymore. But in a week I'll play at a friend's place / club

So I finally set my U-Mix Control Pro up and started to get used to the workflow. It's a great thing...
All of a sudded the crossfader stopped working correctly. I wasn't scratching or anything, so at first I thought I hit some button or entered a certain MIDI shortcut or accidentally changed some settings...
But now I've been checking everything, even looked at the mapping, but the crossfader still won't work again. The fader within the software sometimes moves a little if I play around with the hardware fader, but I'm never able to change to the left player, the software fader will always stick to the right or go just as far as the middle... Also I have to move the fader fast in order to get any reaction from the software fader.
If I move the software fader to the left everything reacts as expected.
Also I tried to set the crossfader to reverse, but this just changes to problem to the other player.
If I move the crossfader fast, I sometimes get two crossfaders within the software (just for seconds though).
Is my crossfader broken?
Thank you for your help!