Thanks for the assistance sadly this did not work out.:(
I tried a powered USB hub:
Monitor
G19 keyboard
Mad Catz keyboard
Anker usb hub 3.0
Anker usb hub 2.0
Changed in registry the power saving to off.
Sadly I still think it might be an ArmA 3 issue as this specific issue with thee 3 devices only occurs when connecting to a ArmA 3 multiplayer server.
Not in Elite Dangerous, WarThunder, Star Citizen, IL2 BoS, Battlefield 4/3.
I will be very happy about any advice you can provide.