Best answer by Ken_Griffiths
The only thing I’ve seen/heard in recent times, within this community, is that the Sonos Bridge is today considered by many, as rather ancient technology and it’s old power supplies tend to lose their 'steady' voltage output, which is needed for stable performance.
It’s probably a case that your Sonos Household/Account has been identified as one that still uses the old Bridge.
The improvements to Sonos software and hardware in more recent years, plus the advancement in router Wifi technology, likely means your Sonos system is probably going to be better off, either by running your Sonos devices on your routers WiFi signal ...or by cabling an existing speaker, (or the much newer Sonos Boost), to your main router instead.
The decision of what you do about the email, of course, is upto you. I personally chose to swap my old Bridge a while back for the newer Sonos Boost.
The cheaper way, is to switch the system over to the routers WiFi signal and this document explains how to go about doing that, but personally I still like the idea of cabling one of the newer Sonos devices to the local network.
Hope this link helps:
Switching Sonos Connection Modes