I have submitted diagnostics with confirmation number 2000449773.
Hope someone can help!
Best answer by Airgetlam
Since you do have a Bridge, it is possible that the power supply on it is flaking out. If you can, try a test of directly wiring the router to one of your speakers, instead of the Bridge. If that resolves the issue, you've got a couple of fairly easy potential fixes. A replacement of the the power cord on the Bridge can be gotten on Amazon, or you could potentially just upgrade to a BOOST, which is actually a newer and better design of the Bridge's function. Works a little better, and isn't too expensive.
But I think while I waited until Monday for the forum staff to return to look at your diagnostic, I'd try a simple refresh of your local wifi, which would include the IP addresses assigned by your broadband router, which is used by the Sonos Bridge. Unplug all of the Sonos devices, including the Bridge. Then do a simple power cycle of your router. Then plug back in the Sonos devices, and see if that resolves the issue.