Hi,
since the last software update Sonos is not stopping anymore. If I press stop on iOS or Mac software, it pauses for a second but then reconnects and plays again. Same with hardware button.
Experienced on Play:1, One, ROAM and Beam. And with Sirius XM or TuneIn Radio stream. Did not test with other speakers or streaming sources.
Only way to fix it is mute volume or remove/ungroup speaker.