Constant audio dropouts Apple TV Atmos

First time Infuse subscriber. Streaming from Plex to Apple TV Infuse app 4k HEVC files with EAC3 Atmos tracks - I was very excited to see the Atmos light on my AV receiver light up - but very disappointed to hear the audio drop out constantly. By constant I mean once or twice every 5-10 minutes for a split second - enough for the receiver to loose the signal completely.

Signal path:

Plex server → Ethernet → Apple TV Infuse App → Ultra High Speed HDMI Cable (2m) → LG C9 eARC → Ultra High Speed HDMI Cable (2m) → Yamaha RX-V6A TV input

I haven’t tried to debug this yet - wanted to put it out here to see if there were any tips or if this is expected with this setup.

First two thoughts. Maybe one of your hdmi cables is glitchy. Try swapping it out. Other thing is possibly the audio track itself has issues. Have you noticed any issues streaming from Apple TV app or something else with Atmos?