I have had Virgin for about a week and todate my SONOS will work but then stop and restart later, message comes up 'network insufficent' on occasions. Very frustrating and poor. There is an answer on the forum already but to IT for me.
Youll need to split the Wifi bands, disable channel optimisation and select a clear or less congested channel for the 2.4Ghz band.
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Sonos also uses its own wireless mesh where it feels the network it is connected to isn’t good enough..
a lot of the complexity is abstracted from the user to provide a system that “just works” with lots of moving parts underneath, many of which aren’t configurable.
one thing of note though, which may help, is that when you set up a Sonos system the first player you add becomes the master/coordinator for the other players you add. If, in your configuration, this happens to be the one farthest from the router, it could well be causing you issues.
first suggestion would be to set the Sonos system up again, and make sure that the first one you configure is the one closest to your hub..
edit: this is in addition to what Gary has suggested above
I would suggest that you get the Sonos user support involved. They took 4 hours to reconfigure my system and supplied me with a free Boost to replace the old Bridge which was not working on the S2 system. Also they warned me that I could not expect the system to work correctly if I tried to use WiFi boosters. The only solution to cure the black spots around my property would be to install a separate mesh for house WiFi.