No need to reset, it doesn’t help.  Go into the setup and separate the stereo pair.  Then, if the missing unit reappears, reconfigure as a stereo pair.  If it doesn’t reappear, try adding it as a new product. 

I can’t find those items. Which app are you using?

Ed

https://support.sonos.com/en-us/article/separate-a-stereo-pair

https://support.sonos.com/en-us/article/create-a-stereo-pair

https://support.sonos.com/en-us/article/add-a-new-product-to-an-existing-sonos-system

That would be the Sonos app, on either Android or iOS. The desktop versions of the app no longer have those abilities. 

Where do I get those?

Ed

Are you serious???

How can you say in your initial post “I was playing with the buttons. In the app I get this display; Living Room (?+R)” and now you ask “where do I get those”??? Just what can’t you find ?

Any Android, or iOS, App Store - or the S2 Sonos App is also available here:

https://support.sonos.com/en-us/downloads

Let me know the app, and how to navigate to the place where I can “ reconfigure as a stereo pair “.

Ed

Moderator Note: Modified in accordance with the Community Code of Conduct.

@Ken_Griffiths gave you the information you need on where to get the applications.

The Sonos iOS or Android app.  As to how to navigate, I gave you 3 links above to the full instructions.

I’m sorry, jgatie. I was exceptionally rude there.

I can’t excuse it, but I can give some mitigating circumstances.

I have Sonos apps everywhere; have had them for years. On Windows PCs, iPads, android phones. And there’s Sonos, Sonos1, Sonos2.

A plethora of apps.

I’ve got it sorted now; more by trial and error than elsewise. Interesting journey into wifi.

Ed Cryer