Speakers in a Group drop out when audio switches

In the Nighthawk app.  Also make sure that your Starlink router is in bypass mode, and not transmitting it’s own wifi network that device might be trying to connect to.

It does have its own network, so I should put the Gen 3 Starlink Router in Bypass mode, Roger that

Tried but there is no setting in the app to setup reserve IP addresses, when I asked Gemini I got this:

When I try to log into Starlink directly via 192.168.1.1 I get this:

This the same deal for all other routers?

Yes for ones set to use DHCP (IPv4 and IPv6) to obtain addresses from the ISP’s servers.

There are other methods that are used, mostly on legacy or specialty connections.

Do note that the above is your public IP, which has nothing to do with your internal LAN’s IPs. Sonos uses internal IPs to communicate and the router is used to connect them to the external/public IP.

I am not able to make reserved IP addresses, Starlink is not clear how this is possible, cause I can’t login to the router directly like a normal router. The app allows for some pretty detailed functions but no reserved IPs

With that being said I was able to plug a Symfonisk bookshelf via ethernet that was in the lobby, I installed the speakers again anew and things seemed perfect in fact one Play 3 could not connect and flashed a rare LED error so I though that I really solved the problem with a bad piece of hardware, it resolved the issues where speaker drop out in that first 30 seconds, so I thought it was good to go, I was very excited….however that was short lived...the audio started to skip again.

Like dude the speakers are next to Mesh 6 routers and still issues, honestly doesn’t make sense. Sonos customer support says there is some sort of interference, but there is no business to my right and the Starbucks to my left has terrible wifi that barely makes it here and they are closed in the evenings with Wi-Fi off so I know there is literally no interference unless we are now counting cell phones, even then if its just my phone the issue happens.

Unless I missed solution, after 2 years of audio issues, I now need to make a change….time for 6 Era 300s and 2 Era 100s and Sub Gen 3. This will resolve the issue on many fronts, eliminate Sonos Net which seems to hinder more than help, add Wi-Fi 6 support for much better Wi-Fi signal, but most importantly we will have Bluetooth backup now, which is a critical added feature. I need a consistent solution as we open more studios.

You say “I installed the speakers again anew and things seemed perfect”. Do you mean you did a factory reset and then re-installed them? If so this lends weight to the issue being duplicate ip addresses. The router will have had to issue new ip addresses during setup. 
If so, I fear that new Eras will be prone to the same problem. 

Some have said it takes minutes to setup reserved IP addresses, sadly I still cannot do this can anyone walk me through? Sonos support says to reach out to SpaceX and SpaceX does not have a phone number to call and emails refer to their manual that talks about reserved IP addresses and that Starlink router only reserves them for 30 mins. 

Can anyone help me set that up?

Meanwhile this is one of my lobby speakers hardwired to Ethernet...now imagine what you are about to hear is happening with 6 Play 3's in a full workout class environment, take a look and listen for yourself 😬:

https://photos.app.goo.gl/BE5kT1VDCHqxwShx6

Has to be the worst sound glitch ever...

This issue has been going on for more than a year: are you out of contract with your service provider? If so see what router you can get from alternative providers. 
Or, another consideration: can you hang a travel router off your Starlink router and use that to control your Sonos devices? Perhaps others on this forum can comment on that as a solution?