Reply to Kontrol S4 problem - Master LED-Light

Hi!

I've been experiencing a problem lately with my Traktor Kontrol S4.
When I plug my controller, all the lights blinks one time, like it does on every start-up of the controller.
But when that's done, the only thing flashing is the Master(USB?)-LED.
What does this mean?

I've restarted the controller, Traktor 2 and my computer.
I've also checked device manager and I CAN see the controller in the USB-hub section.

I've seen a couple of threads on different community s with this problem, but all in all, no solutions.

So does anybody have an Idea what this could be?