I see this issue have been around a while but I guess it keeps happening.
I just purchased the arc, sub and two Sonos SL and I was listening to music through Spotify. I adjusted the volume down and turned the screen of and put my phone in my pocket. The volume increased fast and reached 100% within a few seconds. Both me and my daughter had a scare (however, she cried more than me). Now, I capped the volume seeing as I want my kid to grow up being able to hear But it seems as using the spotify-app is not entirely stable. Had the same problem once again today.
Speakers are up to date, Sonos and Spotify as well. Running ios 15.
Best answer by AirgetlamView original