My Simucube 2 Pro is causing some EMI and my keyboard usually acts as if I would constantly press “ctrl” or “alt” 
.
I know that it is coming from the SC2 because it doesn’t happen when the SC2 is not in use.
Any idea how I could get rid of this EMI?
(I have already some ferrites on all my USB cables)
Have you checked the drivers and software for the keyboard? I had issues with mine and updating those solved it.
Had similar issues, (my Keyboard’s LED’s Start to illuminate when i move by, Monitor do funky stuff when i lean forward in my rig,for example) in my case it helps to “discharge” my PC (pull of Power cable, hold Power Button some Seconds) and get a cleaner cable Management… seems like motherboards are subsceptible for EMI thingys…i repeat it every now and then…
I had some EMI issues on my rig is well. Don’t know exactly where it came from since I got everything new together with the SC2, but after having installed a powered USB Hub to connect all my rig hardware and redid the cable management all problems are gone 
Yes drivers and software are all up to date.
Just did the “discharge” procedure but still EMI 
Actually my cable management is good. I also use a powered USB hub.
My SC2 is however not in the USB powered hub but connected to a single USB port in the PC.
Same for my keyboard.