Hey Tobo. I’m experiencing this problem too, since upgrading to Mountain Lion last year - except I get random dropouts in Cubase 5/6/7 too!
I’m quite desperate for a solution. This, and the AudioWarp-export error are leaving me very bitter with Steinberg. I’ve tried booting up with all superfluous background apps off, but the random dropouts keep occurring in every thing from Cubase, to websites to iTunes.
I will eventually try a clean install of Mountain Lion, but I have projects in progress right now.