I have what I believe is the same issue.
Here's the setup:
- 2021 Macbook Pro M1max, macOS 12.0.1 Monterey
- RME Fireface 800 (Unit v2.77)
- Connection: fw 800 cable => Apple FW800 to Thunderbolt 2 adapater => Apple Thunderbolt 2 to Thunderbolt 3 USBC adapter
- Fireface Settings & Kernel: v3.41
The first few minutes of use seem completely perfect. All I/O functioning correctly.
But out of nowhere, the analog outputs cut out, and not all at once. The headphone out might go out first. Maybe it's just the L channel of the main stereo out. Sometimes ALL of the analog outputs stop sending a signal.
This is all visible in the Total Mix software meters. You can see the analog inputs are working just fine, but the outputs are not. I can still record into my DAW, but cannot hear some or any output channels.
I monitored the Apple Console but could not find any useful errors or faults that seemed related, but I'm not too good at analyzing that information.
Hope this helps clarify. I hope I can find a solution, I love these Firefaces I own! Thanks for your time.