Translation:

have a Beam and 2 One speakers. I managed to put them in home cinema mode. And all of a sudden it doesn't work anymore. When I try to activate the home cinema, the soundbar sets the volume to 0 and I have nothing coming out of the 2 one speakers. So I have to raise the sound of the beam.

Response:

It could be any of several things. I’d certainly try a power cycle of the TV by unplugging it from the wall for two minutes. You haven’t said how the Beam is connected, but I’d make sure the TV was updated, and CEC was turned on. I’d also power cycle the Beam, and make sure that the HDMI cable, if used, was appropriately plugged in, by unplugging it at both ends, and then plugging it back in.

However, if doing all of that makes no difference, 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.

Translation:

Cela pourrait être n'importe laquelle de plusieurs choses. J'essaierais certainement un cycle d'alimentation du téléviseur en le débranchant du mur pendant deux minutes. Vous n'avez pas dit comment le Beam est connecté, mais je m'assurerais que la télévision était mise à jour et que la CEC était allumée. J'ai également mis le faisceau sous tension et je m'assure que le câble HDMI, s'il est utilisé, a été correctement branché, en le débranchant aux deux extrémités, puis en le rebranchant.

Cependant, si faire tout cela ne fait aucune différence, je vous recommande de soumettre un diagnostic système dans les 10 minutes suivant la rencontre de ce problème, et d'appeler le support Sonos pour en discuter. Mais ne publiez pas le numéro de diagnostic résultant ici, ils devent sensibles au RGPD.

Il peut y avoir des informations incluses dans le diagnostic qui aideront Sonos à identifier le problème et à trouver une solution.

Lorsque vous parlez directement au personnel d'assistance, ils disposent d'outils à leur disposition qui leur permettront de vous donner des conseils spécifiques à votre réseau et à votre système Sonos.

Thanks for the tips. Tv and beam are switched off every evening (power bar unplugged). HDMI cable is ok as the beam works fine when tv is on. I’ll contact customer suppôt of Sonos. Too bad they are not opened during weekends…

Potential issue in powering off the Beam every night, it is designed, as is the TV, to receive power 24/7, both enter a low power state when there is no signal. Powering them back on every day requires both devices to re-negotiate the CEC handshake, a process that is complex. 

The beam has worked perfectly for years and still does when used alone.  The issue only happens  when I try to activate the 2 One speakers either for Home Cinema or the “Everywhere” option. The whole system stops and I have a “No content” on the read screen