Yeah I also could never get the USB to work reliably. I did find instructions on another thread to install Apple Bonjour, after that it went away for a day. (maybe placebo…) I could never get a sequence of events that would reliably get that error tuned off. So now I just use 8 analog in/out and 8 ADAT in/out and don’t even have the USB plugged in. But it would be fantastic to have 8 more channels. Kind of a bummer, and it seems like there is no easy fix. Time to look into Dante probably for more channels.