I just gave it another shot:
*) Disabled onboard soundcard in BIOS
*) Downgraded driver
Neither of which worked. It's pretty awful - changing songs in one playlist causes the problem aswell 2/3 times.
I noticed that the music seems to play either too slow or too fast when it's scrambled.
So - now I have Centrafuse that can't play music, navigate or talk in the phone... :-(