Hello Bastian,
Thank you for posting here.
Your experience is in line with what @James_Murphy and I (and others) have experienced. There appears to be some kind of conflict when Roon and Schiit’s Gen 5 USB get together. Support has reached out to Jim at his thread here.
I set up an Odroid Roon Bridge endpoint last night, but had the same problem I had with the Raspberry Pi. Redbook quality files played with no problem. Anything above 16 bit failed.
Then I tried something that should have been done first.
When I plugged the Odroid directly into the Modi’s Gen 2 USB input, the problems went away and everything up to the 192/24 limit of the DAC played relatively fine. (There were some cracks and pops, but at least they played.)
Something is going on with the Gen 5 USB. I have a support request in to Schiit and Roon’s support team is on it from their end. I’m confident it will be working as expected soon.