Hi

Try resetting the Sonos device in the web browser version of the Alexa App: www.alexa.amazon co.uk 

That will normally sort this issue.

Hello

I'm having the same issue on all my voice compatible speakers which have been connected to Amazon for years. Late last night they all went silent, not recognizing the Alexa wake word and sure enough, all offline in the Amazon Alexa app. Disabling then enabling the skill does not work, deregistering all devices and then adding Alexa via Sonos app also results in offline. Interestingly, if I remove Alexa altogether from the speakers and add Sonos voice control as the only assistant, that does work. The minute you add Alexa to the same speaker, neither voice assistant works - the mic never picks up “Alexa” or “hey Sonos” wake words. Extremely frustrating.

@UKMedia - sorry, but I can’t see how to do that in the web browser? Just offers option to Deregister, which I triedfrom the main Amazon pages - https://www.amazon.co.uk/hz/mycd/digital-console/alldevices

@dan02743 - this is identical issue to me.

I noticed it about 21.30 last night.

After all the usual resets failed to work I wondered if it might be the hardware and the microphone was faulty. But like you I downloaded the Sonos voice assistant and found that works OK.

At least it does until you try adding Alexa again and then both voice services are kaput.

I find that selecting the Sonos Device in the web page Settings, often brings it back online.

I'm having the exact same issue with my Move and One. 

My echo dots also stopped working last night but I managed to reset those this morning and they are now working. No such joy with the Sonos speakers though.

As a guess, it sounds a lot like Amazon was having an issue on their side of things. It may not yet be resolved on the servers they use for Sonos connectivity. 

Glad to see it is not just me.  Came home from a few days away yesterday, and all of my 5 Sonos speakers were showing offline in Alexa.  Alexa commands not working -- BUT also, “Hey Sonos” commands not working either??  So all voice down.

First tried unplugging/plugging in Sonos speaker.  No dice.  Tried disabling Alexa skill and re-enabling.  Still no dice.

What worked -- rebooted my home router.

But then again, this morning it happened again.   Just rebooted router and working again.   So not sure why this is happening.  Whether it is on Alexa’s end or on the Sonos end.  But why would “Hey Sonos” not work?

When did the 14.18.2 update get pushed out?   Perhaps it has to do with that?

That would potentially make sense, except why does “Hey Sonos” voice command also not work when Alexa stops working now?   Aren’t they separate voice functionalities?   When did the 14.18.2 update get pushed out (was that in the last few days)?   I wonder if it is related to that.

A fix for me (at least temporarily), was rebooting my home router.

Reboot your home router -- that fixed it for me, for about 12 hours, then it happened again.  Had to reboot router again.  

Now I see that Sonos pushed out its latest update on November 9th and Alexa had an update yesterday (November 12th).  So it is likely either one or the other, or the combination of both.  But I think something with latest Alexa update:   version 2.2.506625.0    -   is not playing well with Sonos.   And BOTH Alexa and “Hey Sonos” stop working.

It’s also possible it is two different things, that look similar in effect. 

I’d certainly be submitting a system diagnostic within 10 minutes of reproducing this problem, and calling  Sonos Support to discuss it, as well as contacting Amazon’s CS. 

She’s back

Did you do anything in particular before it started working again? Or did it just start working? I still have the same issue.

@Mrfrix - Nope just tried her1st thing this morning and she worked fine. Roam also now OK.

Alexa is working here too for my Sonos setup. I’m based in the U.K. in case it’s a regional/country issue, but all working fine here.