Whether updates for the APP are automatic will depend on your settings in your app store.

Updates for the Sonos system are controlled by settings in the Sonos app, namely System Settings, Manage, System updates.

Once the app or the system has been updated, Sonos is likely to require you to update the other before it will function (unless it is an app only or system only update).

This link may be useful to you

https://support.sonos.com/en-us/article/release-notes-for-sonos-software-updates

Next update is Tuesday, issues prevented a release so the bi weekly is not a dead cert.

Thanks John, just checked my settings and they are on auto so all good. Let's see if things improve over the coming weeks. 

Rob