This was my problem! I have Intel NUC connected via HDMI and it had CEC functions as well. So my Beam was cutting out sound every few seconds and I couldnt figure out why!! Until I saw this message! Thank you! I went into Intel NUC bios and turned off CEC functions and now both Beam and NUC are playing nice together!

It is updated to the latest version available. I have changed the output to stereo (uncompressed) for the tv, the Xbox and the beam and it seems to have fixed the issue. The only thing I can think is that my tv cannot process dolby digital very well, however, the tv supports dolby true hd so why it cant even support basic dolby digital is beyond me. I will update on here when Philips get back to me on the issue. 

Did you perhaps try the method mentioned of by-passing the TV? That usually works for the few folk who have TV’s that don’t process the DD5.1 audio signal quickly enough. The speaker can only play the audio as soon as it gets sent the data.

Have you tried changing, or at least re-seating, the cables between the TV and XBox ...and the TV and Beam? I would start with that at least. It’s also odd that your Beam requires ethernet to actually work, which suggests (strongly) that there is either wireless interference, or problems with the Beam’s or router’s WiFi, so perhaps try using different wireless and SonosNet channels and ensure that they do not overlap, channels 1, 6 or 11.

If you have access points or WiFi repeaters, ensure they are operating on the same wifi channels as the main router too and using the the same SSID’s and credentials as the main router. Although these later issues will unlikely be related to your TV Playback when cabled. It’s still worth checking these things however.

Just wanted to share my experience with this issue of audio from the beam cutting out when listening to various devices connected to the tv.  My setup is the Beam connected over ARC HDMI to a TCL 65R617 (in my home office). I have a a Tivo, Chromecast Ultra, and a Nintendo Wii connected to the tv.

The quick answer is that the my Chromecast Ultra was constantly trying to take over HDMI CEC and this was causing audio drop outs with the Beam (I figured it out by simply disconnecting the Chromecast and problem solved).  My solution was to then connect the Beam using the optical audio adapter.  I did not have to disable CEC in the tv’s settings.  An alternative solution was simply to disconnect the Chromecast Ultra, but that’s not really a solution since I wouldn’t have been able to use the Chromecast without having to manually plug it back in everytime.  Disabling CEC on the tv wasn’t an option in this scenario as doing so disabled the tv’s ARC functionality.

Now, there are a few caveats to what I found.  It may seem that the Chromecast is the culprit here and case closed.  The truth is, however, it is a bit more nuanced.  I do have a second identical tv as the one I descirbed above (65R617), setup in another room (bedroom), this one also with a Chromecast Ultra and Tivo connected to it.  Unlike the office tv, the bedroom tv has a Sony CT800 soundbar connected to it instead of the Sonos. The Sony soundbar also supports HDMI ARC and that’s how I have it connected to the tv.  With the Sony Soundbar connected over ARC, there are no audio drop outs when watching cable tv, even though the Chromecast is connected to one of the tv’s HDMI inputs.  I swapped the two Chromecasts to see if the issue followed the Chromecast from my office and no change in the behavior I described above.The tv with the Beam connected still got audio drop outs when I plugged in the bedroom Chromecast.

So, the bottom line here is that yes, the Chromecast Ultra can cause audio dropouts with the Beam when the Beam is connected over ARC and the Chromecast is plugged in directly to one of the tv’s HDMI inputs. However, the Beam seems like it may also be overly sensitive to CEC ‘noise’ or the Sony is simply more forgiving.  In any case, from the number of folks in this thread that have posted their setups were fine for months and then all of a sudden, issues appeared, my guess is a Beam firmware update had the unintended effect of making the Beam more sensitive to CEC signals/noise and thus the audio dropouts.  

Thanks I will try it