intermittent audio through Disney app

Two things to try:

Update the AppleTV and/or delete the Disney App and re-install it.

Hello Lucie, I would try these things: if the problem persists when watching another movie...check the sound output settings (e.g. Dolby Atmos)...if this doesn't help, reinstall the application.

I’ve updated Apple TV, deleted the app and reinstalled, swapped out the hdmi cable…… and still the problem persists

Sonos has no idea what ‘stream’ is playing, only that format X of density Y is coming in through the ARC connection. I’d double check the format that Disney thinks it is sending, as well as the settings the Apple TV is converting things to. I’d also double check both ends of the Sonos cable, to ensure good contact. 

Are the other apps still working? 

Interesting.... How are your devices connected? TV-Apple TV-Sonos Five?

Yes

Arc ultra direct to to via earc Apple TV via other hdmi

I’ve run an hdmi cable check….. all reports as high speed and good……. It’s bizarre…… it’s only the Disney app that is having problems….. I can play the same movie on a different app and it plays fine……. I just would have preferred to trust Disney as the output for sound if that makes sense…… because it’s their movie etc lol

Disney could be playing a different sound stream, based on settings. Others could be playing Dolby Digital, Disney might be using Dolby Digital Plus (Atmos), or even MAT Atmos (I haven’t switched to my Apple TV’s Disney app to check…maybe at halftime, although it’s always handled my Arc without issue). 
 

Something in your post makes me wonder if you’re using a third party (non-Sonos) HDMI cable?