firmware update problem on my S8

...after i did a firmware update on my S8 the controller has started to behave strange.

I have a MackBook Pro i7, 16gb ram. OSX is El Capitan, i did the update to El Capitan when Traktor did the update so it was safe and everything worked as a sharm... But after the firmware update on the controller the problem started..

Laggy display and when i start the controller it only says TRAKTOR KONTROL S8 and when i start Traktor the software can't find the controller and the display don't change to "decks", only black and shows the TRAKTOR text.
I do find the S8s sound card in Ableton but not in traktor..

And after like 5-10 restarts on both my computer and the controller its finally starts up.. but still with laggy display..


Any suggestions what can be wrong? Is it possible to downgrade the firmware??