SS2 on Mac OS X with Parallels 12 - jumping faders

[Palood]

Hi there,

I'm using the Sunlite Suite 2 on a MacBook Pro 15'' late 2013 with MacOS Sierra Version 10.12.2.
For this I am using the Parallels Desktop 12.1.3 for Mac.

In general the software works well and I have no problems.
But one thing doesn't work:
Using the faders for example dimming, speed, phasing, etc.
When I am using these faders the faders moves very fast. So I cannot change them in detail for example only one or two percent.
I always get jumps of about at minimum 30%. So I can set the dimming fader for 0% or 30%.

Is anybody using the same software versions and can give me a hint how to prevent this problem?

Thanks a lot and best regards,
Jan