Possibly IP address conflicts.

Turn off your router and all Sonos. Power on router, then each Sonos device.

Report back, and seek further help if necessary. 

Seems more like a sonos issue.

Not an issue with my equipment/ internet/ router / ip address. 

This was happening at my old house with completely different internet /router setup also.

It’s an issue many others are having. 

I should not have to keep resetting routers and unplugging speakers to make my $15,000+ sonos speakers working. 

Fix the system and get rid of the bugs or I am done buying sonos.

OK.  Keep your problems instead of resolving them.  The app is just a remote control, and you are doing the equivalent of blaming your TV remote for a bad picture.

My Sonos system still works flawlessly.  How come, if the system is fundamentally trashed as you claim?

Not quite champ..

Thanks for the input though.

Well, I hoped to provoke you into trying to tackle the issues and resolve them, but it seems I have failed.  If you haven’t done so already, I think you should call Sonos Support.  You might run a system diagnostic first and note the number.  I bet this would throw up something.

But your call, obviously.