When did you start noticing this?
I saw now that it’s the same in 6.5.5 (64 bit) so maybe it’s hardware or OS related rather than Cubase. Never had this problem with the previous computer. I could wake it up by moving the jog wheel though which I prefer to moving faders.
I’ve also had problems with the scribble script not loading correctly. I have to go to device setup and reset the affected unit to fix it. After that it works flawlessly.