I’m not experiencing this on my Arcs, which aren’t your Beam 2 by any stretch. If I were you, I’d 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.

I’ve gone that route once before without any success.  I had to remedy the issue myself over a three day period totaling about 9.5 hours.  It was painful.  This new issue is so subtle that I would imagine alot of people probably don’t even realize it’s happening or, may see it as if that was how it had been originally produced.  It really isn’t as noticeable until you start looking for a solution.  Like I said it’s very easy to understand.  All you have to do is pause the content for 2 seconds then unpause.  Viola.  Voice is back to full or “normal” volume.  Whatever you want to call “normal.” lol

What is your video source where this happens? (Apple TV 4K, built-in TV apps, Firestick, Blu-Ray…?)

That’s a great question!  Now you have me thinking that it’s probably the old Apple tv (Gen4) that’s causing this issue.  Ever since ios 18 came out, Apple has been taking away features from this generation that we already had.  I get it that they want people to “upgrade” their hardware however, I’ve been burned by buying a generation of hardware “on sale” of course thinking it was a good deal only to realize that the next generation was just around the corner.  I will never let that happen again.  I’m hell bent on waiting for an AI ready Apple TV that I’m sure will be available this year or next.  I’ll suffer from these minor inconsequential deficiencies until that happens.  I’m sorry for thinking it was Sonos failure.  It’s definitely all Apples’ fault!  Yes, and mine to an extent.  You have to agree that Apple is very greedy when clearly these devices are more than capable of running tvos 18 and beyond.  Sorry Sonos.  My apologies!

It does sound likely that older tech isn’t playing nicely with the new tech. But even so - do you have the Apple TV’s audio settings 100% optimised for the Beam 2? And/or - bearing in mind the Apple TV’s sound has to go through the TV to get to the Beam - are your TV’s settings also optimised to ensure a smooth transfer to the Beam? Ideally the TV’s sound is set to Passthrough if available to ensure the TV plays no part in processing the sound. (And do you have the Beam in the eARC HDMI port of the TV?)