I have had issues with my system for a long time.
Response from my phone has been crap at best.
Sometimes it worked but was extremely slow often it did not work at all.
I have a modern WiFi that gives me a connection that works for 2.4 GHz as well as for 5 Ghz.
Sonos speakers use 2.4 and my phone use 5.
Making a new net using only 2.4 and connecting my phone to it solved everything.
I now have two nets. One for my computers and stuff that needs faster internet and another for the phones and Sonos.
It is for sure a work around but it works.
Sonos should solve the issue since most modern routers works as mine.
I hope I can help someone else with this post. Since I have been struggling whit this issue for years before this struck me as it might be the issue.