In general there isn't Jochen. It's more of an inconsistant issue that on occasion pops up.
That's why I say that unless you're having this problem you can't seem to duplicate it at will. The issue has to already be there to show/confirm KiX doesn't work and NET USE does.
I've been there, I've seen it and I now have many years of KiXtart and Networking experience to say that "something" is not the same with how KiXtart is doing it and how NET USE is doing it.
Have never personally had NET USE not work, but have had KiXtart not work.
There is no way that I know of to duplicate the problem, you have it or you don't. If someone that is having the problem knows of a way to 100% duplicate it please speak up as I don't know how to do it.