I reset the phone and the behavior remains. The Pandora app itself closes shortly after screen lock, and needs to be re-opened, at which point it restarts the song but remains connected to airplay.
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For the past week, Pandora stops playback for airplay when the screen locks. This is happening on three different mobile iOS devices when playing to Sonos One via airplay.
I uninstalled and reinstalled Pandora, and that worked for one session. I updated the Sonos system, but that did not help.
Pandora app is on latest.
iOS devices are also all up to date on 17.4.1.
Moderator Edit: Changing title for clarity
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