AAC 7.1 audio stutter on Nvidia Shield Pro

I’m having some issues with a couple of videos that have AAC 7.1 audio, they play back, but are stuttering continuously.

I have the shield plugged into my AV directly, and haven’t done across this issue on any other audio formats, have even found AAC 5.1 is fine, it’s just 7.1 it seems to have issues.

Plex is setup to pass though audio and in the Shield I have it set to match content audio resolution, with pretty much all other audio options turned off

My AV is a Sony DN-1080 that is then running into an LG CX, I have checked the AV and all HDMIs are unlocked to full

The setup has no issues with the likes of True HD, Atmos DTS X, or any other format I’ve come across, only AAC 7.1, any ideas or suggestions?