Since updating automatically to the new sonos app, we've had issues. The app takes ages to establish a connection with the sonos speakers, sometimes it won't allow them to be turned on or off, the volume is all over the place. It's very slow and sometimes non responsive. We've done the full  router and speaker reboot, changed wireless channels and still the same. Hopefully there will be an app update fix soon to rectify the problems created on what was a perfectly good and easy to use sonos app. In this case, unfortunately, trying to improve it has made it into something I dread using. Now considering changing to a new speaker set up, but not sonos......shame, as I did like them pre new app!