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My Sonos starts playing spontaneously when my phone (Galaxy S10) connects to my wifi as I drive into the garage while Google Play music is connected to Bluetooth in my car. This happens even when Sonos app is closed.
I've played with the settings but can't get this figured out. I think I'll have to uninstall Sonos from my phone and use another device to control Sonos.
Highly annoying!
The feature that is affecting you is the auto-transfer of a music stream. Same thing will happen in reverse if you are listening to a podcast on bluetooth when you get into the car. The phone seeks 'available audio services' to try and continue your audio experience.
I don't know if it can be turned off. But a quick fix may be to turn off the entertainment system in your car before you turn the engine off. That should stop the audio-stream and thus the transfer to the Sonos.
Same thing has happened to me twice today. No one else in my house. No one else who has ever used my Sonos network is playing anything. No alarms. Phone locked and not in my hands when it started. No cats or any other animal near any of my pieces. In my case, it’s Amazon. Didn’t think to look the issue up until quite awhile into the second play. Spooky.
The next time it happens,submit a system diagnostic within 10 minutes of experiencing it, and contact Sonos Support to discuss it. They'll be able to tell you what started the music, whether it was an alarm, a button press, a controller, or a Spotify person who has had access to your system in the past.
I suggest the phone folks, they have more tools available because they're on the phone with you, but they are only available Monday through Friday during business hours. Both the Twitter and Facebook support folks are available 24/7.
That's a pretty good indicator that the buttons on the device you were running the Sonos App on are being pushed in some way. Either they're sticky, or hitting against something in your pocket, etc.
This just happened to me in the he middle of the night. No cats or dogs here, so maybe ghost? I’m the only one with Sonos app in the house, and it was not uploaded and not updated on my phone when this happened. Curious to see this is happening quite a lot to people.
No problem with Sonos has ever been identified for this symptom, they have all been external factors, both hardware (cats, CR200s) and software (Spotify app, automation code).
Author of the leading independent Sonos apps for Android, MacOS, iOS, Windows and Xbox.