It could be wireless interference. Are the speakers and Apple TV around a lot of other wireless devices?

That’s odd. Have you power cycled both the Apple TV and your router? I would put money on the Apple TV, myself, but either way, AirPlay 2 should not be disconnecting while it is playing. Apple does have a time out, I think, when not sending/receiving anything, but that certainly doesn’t sound like what you’re experiencing. 

If power cycling these other devices doesn’t help, I would recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it. But don’t post the resulting diagnostic number here, they get sensitive about GDPR.

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.

Oh, I hadn’t thought about the potential for periodic wifi interference , or a duplicate IP address issue, as ​@GuitarSuperstar points out. 

Hi Guys,

thanks for your advice.

I will try to investigate.

Have a good day

I also have an Apple TV, but when I use Airplay to listen to music I connect directly to the speakers rather than through Apple TV.

Never had a problem like this.
As written, it could be the Apple TV going to sleep.
Check these settings on Apple TV.
General-Sleep after-
Screensaver-

Good day,

I discussed yesterday with the Apple Support Team and today with the Sonos Support Team….

From Apple, it should work,

from Sonos, better to use a soundbars, like this there is a physical connexion between the TV and the sons system. They can not guarantee that it’s work, even strange that I succeeded to have sound during few minutes/hours.

@ Airgetlam : thanks for your advices.

@ Peter_254, how did you connect the Sonos system to the speaker, maybe I’m not a so good guy to know how to do this, if you can explain, I will appreciate, thanks in advance.

I will continue to investigate.

Thanks for your answer.

Best regards

@ Peter_254, how did you connect the Sonos system to the speaker, maybe I’m not a so good guy to know how to do this, if you can explain, I will appreciate, thanks in advance.

First, all your SONOS needs to be on Wifi and the same Wifi as your phone.
Open your Music App, click on Airplay and choose what you call your SONOS system.
My Ultra-Sub-Era 300 is called Stue, so I just choose Stue and then it will stream music from your phone to your SONOS system.

Hi Peter,

Thanks a lot for this answer.

My system is working as you describe.

My pb is when I’m on the Apple TV configuration, I choose for the audio, not the TV speaker, but the  2 Era 100 associated to be a stereo system, it works perfectly, but after ½ hour or more, no sound.

I need to power off / non the Era, and to select again the audio from the Apple TV configuration.

Maybe it’s not the right way to use the Era 100, and Airplay.

For sure to listen to the music, it’s a perfect system, and works perfectly.

Thanks again for your time.

BR

Fabien

Ahh ok, so when you watch TV/Movies Youtube etc. from your Apple TV you choose Airplay from your Apple TV.

There are several options now that you have challenges.
The first thing you can try is to update your Apple TV to the new beta version, maybe there is a bug in the tvos you have installed. (I have beta myself without the slightest challenges)

Maybe you can choose to use Airplay from your TV in the sound settings on the TV, that way Apple TV delivers sound to your TV so you avoid Airplay from your Apple TV.

Last but probably the best, buy a soundbar and connect it to your TV, then the soundbar is responsible for sending the sound to your other devices.
Then you also get surround and can achieve Atmos.
Can recommend Beam (gen2)-Arc-Arc Ultra.

Thanks again for your time and advice.

And I agree with you maybe the sounder is the best solution.

Have a good day