Sonos S2 system not working well

So @bluezapfel , if you want to tell us about your network and Sonos set up, there are people on here ready to try to help - with no guarantee of course.  Mesh or conventional?  Access points, extenders, EoP?  Wifi or SonosNet?

Of course I'll help, that's why I spent the time to post.

I have an Orbi with 3 satellites, one  being an outdoor satellite. I have three play 1, one play 3,  one play 5, with  the sub connected to it and now Sonos move.

when I got the Sonos move I upgraded from s1 to S2. And that's when all the problems started. I had no issues before going to S2.  And it makes no sense to me why upgrading the app has started causing dropouts and lag issues. But it did. I don't know what their app does and how it communicates and configures all the speakers and keeps them in sync etc. 

Hi. The app does none of that, the system does, and in the same way S1 did.

First question.  Do you have any Sonos device wired to your network, or does everything connect via WiFi?

Second question. It is pure Orbi, no other router involved?

Yes just Orbi, all wifi. 

OK. Now please bumour me even if you don't see the sense in this. Take one of your Sonos speakers and connect it by Ethernet to your router, even if it means moving it from where you want it, just as an experiment. Don't place it right next to the router - leave a 3 foot distance if possible.

Then go into the Sonos app Settings, System, Network, Wireless Setup and remove (reset) your network SSID and password from Sonos. 

Wait a couple of minutes then look in the app to see if all speakers are present. Any that are not, power them off and on.

Can you fix the 2.4GHz channel on Orbi or does it have to be automatic? If you can fix it, choose 1, 6 or 11 then make sure Sonos is on a different channel. ( in Network Settings).

Basically I am switching you to a SonosNet setup. What surprises me is not that you are having problems with S2 but that you didn't have problems with the old app and system. 

Please give it a try and see if stability improves.

As a bit more explanation,  there are features of most mesh systems that don't sit well with Sonos in WiFi mode. For example, satellites using different wireless channels prevent the direct routing that Sonos uses, and this can degrade performance. It doesn't mean Sonos is buggy and it doesn't mean there is any fault in the network.  But it may still be problematic. SonosNet gets round most such issues. 

What an update can do is disrupt an apparently stable setup, what with all the reboots. That is what may have happened here.

I can't be sure what is causing your problems or promise my suggestions will fix them,  but they might.

I will give that all a try and report back. Thank you for the detailed explanation

i am having a similar issue.

i am convinced the S2 upgrade degrades the wifi connectivity. Units  that worked perfectly no longer connect  after the upgrade in their identical locations. When Imove them closer to the router they connect; move them back and no more.

what a disgrace !

Adding my voice to this. 
I thought S2 would be a more reliable platform, but it’s much worse. 
I have 5 speakers through my house on Sonosnet, with a boost. 
Basic things like pressing Pause do not work reliably. The current input takes ages to show on the app. Adjusting the volume is laggy. Sometimes when you open the app, your previous volume settings apply and all of a sudden the volume jumps up. It’s ridiculous.
Please put your software development energy into making play controls and volume adjustment work smoothly instead of pointless crap like the current updates have given us. 

curious to know if your stuff is the newer models or so-called legacy products. 

in other words, do the current models avoid  the problem.