As users like you, we can’t say.
Environments change. New WiFi networks in neighbouring properties; radio interference from all kinds of devices, pushed updates to routers than change settings without warning…
Next time it happens, generate a diagnostics report within 10 minutes, and contact Sonos support. They may be able identify the cause.
There’s no ‘easy’ way to confirm much of this, it requires a lot of seemingly random things to see if any of them work. I’d start with the wifi interference FAQ, and see if any of those solutions help. After that, I’d move on to a network refresh, which has the potential of fixing both DNS and duplicate IP address issues, should something have gone astray. Unplug all Sonos devices from power, then reboot your router. Wait a couple of minutes, then plug back in your Sonos devices.
But if none of that works, I would recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it.
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 Support staff, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.
edit: @nik9669a types faster ;)
Why is Sonos so 'delicate' that it is so affected by small changes in its environment? My other WiFi attached items of equipment are ok.
Why is Sonos not fit for purpose in the real world.
SONOS units are very “chatty” with each other and there are timing constraints. A delay of a few tens of milliseconds for a web page or printer is not a big deal, but it will devastate audio. Video streaming is one way from the video server, requiring no local “chat”.
The new SONOS update uses the network differently and the default configuration of some networks is not very cooperative.
Many of us are not having issues, but I know that there are others who struggle.
Give us information about your SONOS system and network. Model numbers? Are there any wireless mesh points? Extenders?
