multiroom system is pants.

If you can give some information about your network that would be great.

I have many of the same speakers in my home as you do that total 11, with 6 of them hardwired to my network with ethernet. I have always had a main speaker, like a soundbar and Amp, hardwired. Even from the day the new app was released, I have had very minimal issues. I did experience the sluggish volume issue for a couple hours, but everything else I use, has not stopped working for me.

If you bet the latest app release, it has solved much of the lag issues for most folks.

You could try the Sonos Wi-Fi FAQ on reducing interference or submit a diagnostic and call Sonos.

Hi thx for that I believe I have the latest app,  the arc is wired the rest are wireless. It is currently on network channel 1. I have reset everything ( well a power cut sorted that ) . I am on virgin with 1gig broadband.

Think I’ll have to call Sonos I’ve submitted a diagnostic report. I recommended Sonos to my nephew who has a bar he bought 4 x Sonos 5s and he’s getting loads of connection issues too. Can’t skip tunes can’t stop playing etc. seems like the whole system is very poor at the moment.

Would it be hugely difficult to make one or two more devices hardwired rather than wireless?

Sonos used to publish a guide that recommended one hardwired device per 5 units installed, and I suspect that this is still a good policy - especially if you play higher-resolution material.

On my system, this made a positive difference to the delays in re-synchronising after (for example) jumping from one track to another.

With newer Wi-Fi Sonos is no longer recommending wired setups in most cases as Sonosnet is older/slower tech. They even dropped Ethernet ports on some devices and made it an extra cost option on others. Many now don't even support Sonosnet. 

It does make you wonder whether the most recent firmware updates have made network performance worse by removing Sonosnet features. As I understand it, Sonosnet used to allow individual speakers to (in effect) “relay” content to adjacent speakers, which could under some circumstances extend the range of wireless coverage.

But, at a simpler level, each hardwired connection means one less devices needing bandwidth from the limited capacity of a wireless network, freeing up capacity for other devices to use.

The issues aren't from removing Sonosnet as it hasn't been removed, new Sonos are just set n9t to use it. 

In the old days of one central Wi-Fi point the Sonosnet mesh was handy, today it just means you need an additional Wi-Fi channel. One that will be slower and lower tech than most current hardware.

Today most Wi-Fi supports much better range and throughput making Sonosnet a second class transport.

For Sonosnet v1 and less so for v2 bandwidth was an issue, modern Wi-Fi rarely has issues with the small amounts of data Sonos uses. If your channel utilization is under 50% (from my li,ited testing) Sonos should work.

Wired is still an option as is disabling the radio but both are best reserved for special situations. 

This will only work for older Sonos gear that supports Sonosnet.

Not true - as I said above, every hardwired connection is a connection that doesn’t need wireless bandwidth.

If wireless capacity is limited (for a number of reasons, some of which may not be “visible” to the owner of the property, such as what their neighbours’ wireless equipment is doing) then removing traffic from the wireless side of the network may help, even if Sonosnet is “there but not being used”.