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After setting up the playbar and 2x Sonos one as stereo pair. I am happy with the sound. Also I have an Sonos SL elsewhere in the home. 
But after like a few days and using the app for volume and control. Randomly the speakers one by one or sometimes even totally are out of the list. Sometimes they pop in again, sometimes I can reconnect them through the app but button not always available. Sometimes I have to reinstall the whole speakers.
 

Connection from WiFi looks very stable for all other devices. 

 

Any ideas why they would go out of connectivity? Or what can I do towards the system?

Sounds, at least potentially, like a duplicate IP address problem, although it could also be a wifi interference issue.

Try unplugging all your Sonos devices from power, then reboot your router. Give it two minutes to reload everything, then power back on your Sonos devices. Give them a couple of minutes to boot back up before testing.

If this doesn’t work, check the linked FAQ. And if that doesn’t help, I would recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it. But don’t post the resulting diagnostic number here, they get sensitive about GDPR.

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.

When you speak directly to the Support staff, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.