I’d first try a reboot of your router, followed by a reboot of your Sonos devices, to see if that fixes the issue. However, if it doesn’t, I would recommend that you submit a system diagnostic , and call Sonos Support to discuss it, or post the number here.
There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.
When you speak directly to the phone folks, there are more options available beyond just the diagnostic analysis.
I am assuming the OP has edited the original post at about the time @Airgetlam posted.
Hi,
Thank you for the response. The issue appears to have resolved itself.
Stuart