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The IOS 15.3.1 update has made Sonos S2 app not work well.  It is tough and locks.  Does anyone have this problem? How to fix it?

Nope, in my case I have iPhone XR and iPad Pro 3rd Gen, each are running iOS 15.3.1 and both S1 and S2 Apps (latest release) appear to be working fine… maybe try a reboot of your iOS device, or a reset (or reinstall) of your Sonos App.