Hard to tell from your post. Is the Beam connected to a TV? Which one? How is it connected to your TV? Optical, or ARC? How is your Apple TV sending data, over ARC, or via AirPlay 2? What source is dropping out? 

Have you submitted a system diagnostic within 10 minutes of experiencing this problem, and called Sonos Support to discuss it? 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.

The Beam is connected to my tv with eARC. Apple TV is sending data over ARC. I believe it’s the tv apple tv dropping but I’m not 100% sure. 

Again, not much detail. If you think it’s the (insert random make and model) TV, you should likely check it for updates, and reboot it by unplugging it from the wall for two minutes. If you were to submit that diagnostic, and call Sonos, as suggested, you might get more detail.