LG WebOS Plex Player buffering some Direct Play 4K content

LG OLED55B9PLA
Connected via Ubiquiti 5Ghz AC WiFi @ 300mbps RX + 270mbps TX

Server Version#: 1.19.2.2737
Player Version#: 4.29.4

Video is 47.3GB .MKV at 44,414kbps bitrate
Remux 4K HEVC 10-bit
HDR with TrueHD 7.1 & AC3 5.1 channels

Stream details:
Direct Play
No subs
45Mbps bitrate
95.5Mbps bandwidth use (Tautulli)

Issue:
Certain parts of the film experience intermitent buffering. Some parts as much as 5-10 mins with no buffering. Others, particularly at 30min mark, buffer repeatedly for multiple minutes.

Server Hardware, Network Connection, Media & TV all proven capable by switching over to Emby instance running on same Windows machine from same media repository with Emby for WebOS app. No buffering experienced.

Found lots of this in Plex logs, maybe related:
Apr 30, 2020 15:45:38.579 [11596] DEBUG - Setting container serialization range to [0, 49] (total=-1)
Apr 30, 2020 15:45:38.580 [11596] DEBUG - We’re going to try to auto-select an audio stream for account 1.
Apr 30, 2020 15:45:38.580 [11596] DEBUG - Selecting best audio stream for part ID 20195 (autoselect: 1 language: en)
Apr 30, 2020 15:45:38.580 [11596] DEBUG - We’re going to try to auto-select a subtitle.
Apr 30, 2020 15:45:38.580 [11596] DEBUG - Audio Stream: 56509, Subtitle Stream: -1
Apr 30, 2020 15:45:38.581 [11596] DEBUG - We’re going to try to auto-select an audio stream for account 1.
Apr 30, 2020 15:45:38.581 [11596] DEBUG - Selecting best audio stream for part ID 20194 (autoselect: 1 language: en)
Apr 30, 2020 15:45:38.581 [11596] DEBUG - We’re going to try to auto-select a subtitle.
Apr 30, 2020 15:45:38.581 [11596] DEBUG - Audio Stream: 56507, Subtitle Stream: -1
Apr 30, 2020 15:45:38.582 [11596] DEBUG - We’re going to try to auto-select an audio stream for account 1.
Apr 30, 2020 15:45:38.582 [11596] DEBUG - Selecting best audio stream for part ID 20189 (autoselect: 1 language: en)
Apr 30, 2020 15:45:38.582 [11596] DEBUG - We’re going to try to auto-select a subtitle.
Apr 30, 2020 15:45:38.582 [11596] DEBUG - Subtitles: Found a candidate subtitle language [eng] for a foreign film
Apr 30, 2020 15:45:38.582 [11596] DEBUG - Audio Stream: 56464, Subtitle Stream: 56465
Apr 30, 2020 15:45:38.587 [11596] DEBUG - We’re going to try to auto-select an audio stream for account 1.
Apr 30, 2020 15:45:38.587 [11596] DEBUG - Selecting best audio stream for part ID 20055 (autoselect: 1 language: en)
Apr 30, 2020 15:45:38.587 [11596] DEBUG - We’re going to try to auto-select a subtitle.
Apr 30, 2020 15:45:38.587 [11596] DEBUG - Audio Stream: 56081, Subtitle Stream: -1
Apr 30, 2020 15:45:38.587 [11596] DEBUG - We’re going to try to auto-select an audio stream for account 1.
Apr 30, 2020 15:45:38.587 [11596] DEBUG - Selecting best audio stream for part ID 20054 (autoselect: 1 language: en)
Apr 30, 2020 15:45:38.587 [11596] DEBUG - We’re going to try to auto-select a subtitle.
Apr 30, 2020 15:45:38.587 [11596] DEBUG - Audio Stream: 56077, Subtitle Stream: -1
Apr 30, 2020 15:45:38.588 [11596] DEBUG - We’re going to try to auto-select an audio stream for account 1.
Apr 30, 2020 15:45:38.588 [11596] DEBUG - Selecting best audio stream for part ID 20053 (autoselect: 1 language: en)
Apr 30, 2020 15:45:38.588 [11596] DEBUG - We’re going to try to auto-select a subtitle.
Apr 30, 2020 15:45:38.588 [11596] DEBUG - Audio Stream: 56075, Subtitle Stream: -1

Another film. Similar stats. Same issue.

Looks like I’m switching to Emby for 4K content.

Any plans to fix the LG WebOS app?

Two week bump.

My issue has been solved.

Mine hasn’t.
Again right now, sat down to watch a film on Plex and 12 minutes in its unwatchable. Buffering repeatedly. One scene is completely missing in the sense the transcode breaks the image into a very small picture in the corner of a grey screen.

Now I’m watching the film in 1080p on a family Netflix account.

Not had a single reply on the only support platform offered to me, this forum, in 2 months.

Cancelling my Plex Pass. I’m done.

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