I don’t understand why the Sonos 'Boost Mode' is not the best option for you here, as the signal hops between the Sonos devices and would often be a far stronger 'exclusive' signal than a central-based WiFi signal. See the diagrams and explanation of the difference between 'Standard Mode' and 'Boost Mode' here:
Choosing between a Standard and BOOST Setup
My thoughts here, are that you may not have configured 'Boost Mode' correctly when you initially tried it, for example once 'Boost Mode' is activated you should almost always remove your WiFi credentials in the 'Advancec Settings/Wireless Setup' of the Sonos App. It’s not clear, if you did that, or not?
You should also try to configure the main routers 2.4ghz channel, so that it is the least used non-overlapping channel in and around your premises and then go onto set your SonosNet channel at least 5 channels apart from your router channel and also select the next least-used SonosNet channel for this purpose.
To add further stability to your system, I would also recommend adding the Sonos IP addresses to your man routers DHCP Reservation Table.
I think setting up your system with 'Boost Mode' in this way, would provide you with a much better/stable signal than you will achieve with a central router WiFi signal, plus SonosNet is 'exclusive' to Sonos products, so there will be no other devices on that signal to interrupt the flow of data.
The one other thing to briefly mention is a that the faster 5ghz signal is not generally used by Sonos, other than for bonded Home Theatre systems and whilst it is quicker, the signal does not often reach the distances that can be achieved by a 2.4ghz signal. A 2.4ghz signal is plenty fast enough for the Sonos Audio data and that’s why I believe it is still currently preferred.
Hope the above helps to resolve your wireless signal issues.?
When I got the boost I set it up as a new account with all the speakers factory reset and added to the account with setting up the boost first. The shame is when this system works it’s what I’ve been looking for, for over a year. Allows me to control all 4000 albums on my desktop from my phone/tablet and pay it wirelessly throughout my who place including my patio which my PCs Bluetooth would not reach. Then there’s the other side the drop outs...
I would maybe download a WiFi scanner, like wifiinfoview for example and see what is the least used 2.4ghz WiFi channel in your locality and set the router to that channel. Then set SonosNet to the next least-used channel, but ensure it is at least 5 channels away from your router channel.
Then get things switched over to run on SonosNet.
Remove any WiFi credentials stored in the Advanced Settings as mentioned earlier and then finally add the Sonos IP addresses to the routers DHCP Reservation Table and my guess is your device dropouts will likely disappear for good.
Thanks for the input Ken, when I get back home I'll give it a shot.
Just thought I'd update on this, I ended up having to upgrade my router again the Dlink one I'd bought previous was still having issues having a good signal at the furthest spots in my condo from the router. I ended up going with an Ubiquiti Amplifi HD mesh wifi setup and disabling the wifi singnals from my cable router/modem. I tried every combination of channels with both routers and the Sonos Boost, which was still the worst of the three for drop outs. I now run every thing on the Ubiquiti router and have had good preformance out of my Sonos speakers, still cuts out a bit on odd speakers on first song or when I switch songs but usually after about 5-10 seconds all speakers are playing and stable. Is this normal? I run from the Sonos app on my PC, which is a copy of my Itunes library in Losses format. For me it is not a big deal as I listen to play lists or full albums usually.