Hi! Thank you. So, I tried on other USB ports (no USB hub), same problem. Also, I tried with a different USB cable, same problem.
I tried the Keylab on a different computer, also with Cubase 8, however, I don't have this problem on this 2nd computer
I don't know if this is a hardware incompatibility issue on my 1st computer, or if it's a software misconfiguration...I don't know what do do at this point...