My system has started randomly playing different speakers after they have all been shutdown. It may start one on a porch or it might start several. I just shutdown all music to all speakers and verified they were stopped and it randomly started one back again after a few minutes.
Quite possibly it’s a Spotify ‘connect’ session that you have ‘perhaps’ left open on the Speaker(s) be sure to end its session to stop it calling/sending from the source device to the Sonos API.
See example screenshot.
Thats assuming you’re using Spotify App linked through to your Sonos devices over the local network.
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