So I have an Arc for a few weeks now, but I have these audio cutouts when playing from 4k bluray, it happens when there is “a lot” of noise, bandwidth wise, like glass breaking.

Sample:

I’ve already replaced my hdmi cables, and have been with support of sonos diagnosing this. 
Their suggestion was a corrupted DTS in the movies audio tracks, which I question because it's on all 4 john wicks.

Based on my obvservations:

• only happening in 7.1 TrueHD, downgrade to 5.1 over spdif out of bd player is fine (sync broken though)
• only happening with lossless tracks, spanish 5.1 lossy is fine.
• only happening at high bandwidth moments (player reports audio bitrate peaking 7 Mbps)

I suspect it's hitting some DSP limits in the arc that probably cannot be fixen given topic below is 2 years old.

Relevant gear: Panasonic UB824, Philips 55OLED708 (multichannel bypass), Arc+sub+two Fives all ethernet wired.

My question: how can I avoid this from happening, without falling back to pcm stereo audio?

I found one topic similar: