Why does my sonos system turn itself on, playing a random song!?

Hi, yeah it sucks. It happened to me again and this time I did a diagnos. The answer I got is that the sonos can only be controlled through the WIFI. So I changed password on the WIFI & router. BUT through Spotify you don’t have to be on the same WIFI. Therefor I can start a song at a friends house from my apartment... But the songs playing was not played by a friend of mine, there must be some kind of malware that does this (my own opinion). The solution was to log out of all devices through Sporifys website and then change password in Spotify. It hasn’t happened again since, hope it stays like that. Next time (IF) I’ll sell the speaker. Good luck!
... And don't purchase any Spotify Connect-enabled speaker again – ever.

https://community.spotify.com/t5/Newcomers-and-Contribution/Spotify-Connect-over-the-Internet/td-p/1212959

This is happening to me too!!! And with songs that are totally applicable to my life right now!
What on earth??????

Yeah, I hope it doesn't happen again. I've had my system on the same setup for a couple of years and nothing has ever happened before. I hope Sonos takes this seriously though? It isn't just me. Even if it turns up to be the alarm, I didn't set it. Somebody else did.
And this setup isn't a (full) wired one with wireless cards disabled by any chance?

Ah, yes, good point.

But so far, there’s been no confirmed case of it being an issue with the Sonos system itself.

Note that I said confirmed, it may have happened, but if it did, no one has come back to these boards to confirm it.

All previous reports, anecdotally, as I’ve not kept specific track, have turned out to be either alarms set by not the people who were writing in complaining, or external things like people who were connected to the Sonos with the Spotify app which has he ability to start play again while no longer being part of the same Wi-Fi. In the 3 or 4 years I’ve been a regular reader, there’s never been anything other than that.

This has happened to us twice, just happened! I have submitted a diagnostic 1820645923 whats causing it?!

Well, the only other possibility that I can think of off hand is if someone has at some point connected their Spotify account to your Sonos speakers, and then failed to remove the connection. The next time they tried to play on their phone, it would start up on your system, unless you cleared it out, I think.

And I completely understand the not doing the diagnostic when awoken. I certainly wouldn't be able to do so if it happened to me, but I guess if it happens again, perhaps you'll be more inclined to remember to do so. I'll hope it doesn't happen again, though. I generally say within 10 minutes, but I think in truth there's actually 15 minutes of data stored in what is sent when you submit a diagnostic. What I don't know is if it's 15 minutes from the last Sonos command, or 15 minutes of use...so if it happens again, I'd say doing it while you're cursing would be wise.

But those are the only things I can think of that would cause music to play. Oh, random thought, if you have a pet, like a cat, it's feasible that they are on top of a speaker and actuate one of the buttons that start playback. I had that occur once, so I was happy to turn off all of the buttons on my speakers in the controller app.

Did you submit the diagnostic as I mentioned? If so, post the number here, so Sonos can look at the data from your system. Or check your alarm settings, as I also suggested.

What is the source of the music it's playing? It could be someone who connected via Spotify at one point who is playing to your Sonos system. Or, it could be that someone set an alarm on your system, and it's going off.

Why don't you submit a system diagnostic within 10 minutes of having it happen, and contact Sonos to discuss it. There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.