I have been running Volumio for few months now with this very same issue: should i turn off my integrated amp+dac (aura note V2), Volumio won’t be able to find it back (and stream to it) once the integrated amp+dac turned back on.
I get these error messages:
Failed to open “alsa” failed to open also device hw:1.0 no such file or directory
failed to open “alsa” error opening also device hw:1.0 snd_pcm_hw_params() failed:input/outpu error
The only trick I found is to reboot Volumio (sometimes few times) to finally see the dac in the settings and being able to stream to it
Any help welcome on this