I am a lifer with my system at home and very happy with Roon.
I recently purchased a one year membership (for some reason, a trial membership was not possible) for my office system. I have frequently gotten this error message only to have it disappear when I tap the mouse connected to my laptop (a HP bs1xx with i7-855OU CPU).
I reviewed other support cases and did set my firewall to accept roon and raat through the firewall, for both public and private settings (in Windows 10).
My laptop is connected to a Yamaha TSR 5790 via HDMI and to a Netgear PS 2100 storage device.
The “No Audio Device Found” message occurs several times a day but usually only after several hours of Roon Radio play.
I am also interested in any suggestions about how to optimize the signal going through this system to speakers.