Roku: Several seconds into watching Series episode, Plex exits back to the current Season menu

Server Version#: 1.21.1.3876
Player Version#: 4.47.3
Windows 10 Pro Version 10.0.19042 Build 19042
3700X - Roku Express v9.4.0 build 4200-28

Folder structure is
(PLEX) -> (SERIES) -> (NCIS Los Angeles) -> (Season 06) -> NCIS Los Angeles - S06Exx.mkv

Issue began with NCIS Los Angeles - S06E01.mkv

  1. Performed complete Plex Dance for NCIS Season 06, attempted on Roku - Issue persisted.

[FIREFOX http://127.0.0.1:32400/web TESTING]
2. Episode plays completely on Plex web viewer.

[PLEX ANDROID APP on Google Pixel 3 TESTING]
3. Episode plays completely on Anrodid app

[ROKU TESTING]
4. Attempted a few movies - Issues does not exist for movies.
5. Attempted different shows in (SERIES) folder - Issue does not seem to exist for other shows.
6. Attempted episodes from Season 4 and Season 5 of NCIS Los Angeles - Issue does not seem to exist for these seasons.
7. Attempted every episode from Season 6 - Issue persists across the full season.
8. Attempted episodes from Season 7 - Issue persists.

I’ve isolated the issue to Specifically the following:
Only my Blu Ray rips of NCIS Los Angeles seasons 6 and 7, possibly 8-9 as well. I haven’t yet tested those.
And only on my Roku devices.

Logs attached. Plex Media Server Logs_2021-01-12_12-40-22.zip (6.3 MB)

This issue is strange. There is nothing wrong with my .mkv files. I can view the full episodes with windows media player.

RESOLUTION: use Handbrake to encode .mkv files to .mp4 files.

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