Please don’t do another factory reset unless requested by a Sonos rep. Most often it doesn’t fix anything, and always deletes information from the device that might help identify what the real issue is. 

My suspicion is that you just need to refresh your Sonos’ connection to your router. Unplug all of your Sonos devices from power, then reboot your router. Once the router comes back up, plug the Sonos devices back in.

This will resolve about 95% of issues like yours, but if you happen to be in that 5%, I would recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it, or post the diagnostic number here for a Community Moderator to pick up.

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. 

Thank you, I will try this.