I try alot of things and finaly i find the Bug what crashes the Rift S to a Black Screen.
You can reproduce the crash Bug very easy.
1. Download Bigscreen
2. Open a Room (Big Cinema)
3. Let a Friend join you.
4. Sit near your Friend and clap the Hands with him.
BAM crash.... Black Screen....
It is not a Driver Bug or a Windows Problem.... its a SOUND BUG!
Deactivate your Rift S Audio Device in the Device Manager and BING no more Black Screen crashes!
Without Sound or with an other Sound Device you can clap your Hands with Friends for Hours without a Crash.
We can only wait for a Patch for the Oculus Software.
I hope this helps someone, and sorry for my Bad English im German.