people have been noting this usb issue with the Expert on the Devialet forums… it seems to happen everywhere (NUC, Macs, etc). It seems the Devialet does not negotiate the USB initialization properly. The latest Expert firmware added a new option. It is called USB INIT or something like that. Did you try playing with that? You’ll probably have more luck on the Devialetchat forums as well, as this does not seem to be Roon specific.