I'm already using Stereo so I tried the following things in this order with some testing inbetween:
- Uninstalling every Audio Driver, testing and then installing a newer version. Unfortunenately i can't use the driver from the topic because my onboard chip won't support it (I have Realtek ALC1220)
- Putting Game and client on the same Drive
- disabling all other audio outputs
And it still crashes, but I can play for about 20 minutes longer now before it crashes.