It took me some time to get the K22 to show a Digital Output; USB no problem. Once I was able to see Digital Output, I used the AES out to a Mola Mola Tambaqui. After about six hours of playing music through the AES (via Roon), the K22 lost the Digital Output, and only showed No Outputs. I powered the K22 down, and went back to USB, but I much preferred what I heard through the Digital AES output. Is this a firmware issue or a possible hardware issue?
That does sound like a hardware issue, best to book a remote session with the team to check: