For a long time I did not experience the “device in use” problem, but today I observed an instance where it popped up for a second.
I had Roon’s internet radio playing while I switched my VPN on to do some online business. Suddenly the music stopped and in the lower region of the Roon window appeared the message “Device in use”. This disappeared again quickly but was obviously triggered by turning on my VPN. The same happens when turning VPN off. I could continue radio streaming by pressing the play button. It is reproducible.
Switching VPN necessarily disconnects and reconnect the stream briefly, which Roon comments by “Device in use”.
Roon 1.4 (294)
Devialet with RoonAIR connection by ethernet.