I’m facing the exactly same issue as direwolf08 has described. (on a Raspberry PI)
Aso the log locks the same - when it spotify stops playing is shows “[Vollibrespot] : SessionError: Connection reset by peer (os error 104)”.
It is the same error when I play via spotify connect or in the UI. And I tried it with wired connection too.
(But I don’t believe that it is because of the network - the youtube plugin works fine and has no connection issue.)
I’m on the Version 3.0.7 but tried it also with version 3.0.4 etc.
I very much like this approach to stream Spotify on a small device headless - but is is really disappointing each time when it stops. I also shared a log with the Volumio Support, but they pointed me to this forum as the plugin is 3rd party.
So any help is very much appreciated!