Thanks for trying. It is the only one that does it for me. I could try to limit the bandwidth through the firewall, but I don't see any benefit to that.I did watch that video and no audio issues but it barely ramps up to 4K on my network but it is in true HDR. Maybe you have enough speed for 8K and that causes a glitch??
I'm glad to see it is not just my TV, even if we have different models, as it may be due to the app not being able to handle the high bandwidth available on the 8K streams. I think if that clip didn't have the audio dropouts, it would be a perfect demo for this set as the colors (and glimmer of the gold-colored buildings) are simply phenomenal and doesn't really show off any banding and the FALD lag is minimal. The other 8K videos just don't show off the pros of the set as well as that one.I looked at it on a 2018 PQ.
Using the Youtube app on the Display, I got dropouts towards the end (incredible visually). I did other 8K videos, and had no problem with them.
I switched to my Roku Ultra which is piped through my OPPO 203. I watched the video and there were no dropouts.
Both were HDR-10, 4K at 60 FPS. On the OPPO information display, it saw 4:2:2, 2 channel 48K audio and 12 bits.
My internet access is 1GBit / Comcast, wired connection to the display.
A couple of possibilities - the display may have a Youtube app that is not as good as the Roku's. The OPPO does process the stream before handing it to the display, so that may have played a role. The path through the Roku to the OPPO and then HDMI to the display may be more reliable than through the display's nic card.
Good luck, hope that helps. Have you tried just wireless? That may perform better.
I did try wireless only and still got the audio dropouts.
On the Plex side of things, I did figure some things out. Direct Play doesn't do me any good as the TV apparently does not handle MKVs. I can utilize the Direct Stream option (as I rip with both the lossless and any lossy audio, including any bonus commentary), but that did not stop the stuttering. However, when I deselected the subtitle stream from the MKV (I have the Plex server setup to automatically load the subtitles, if available), the HD video would play without issue. In Plex, if the subtitles are not burned in to the video, the Plex server has transcode the subtitles in. So, the stuttering was telling me this was my Plex server not keeping up with the transcoding. The weird thing is, I never had this issue with my Xbox One. So, I can play 1080p BluRay MKVs through the Vizio Plex app as long as I do not have the subtitles enabled. There was absolutely no issue with the SD MKVs even with subtitles enabled.
One last final thought. This TV off-gasses horribly. How long does it take before I can turn this on for a little while without smelling the TV?