HEVC/DTS-5.1 not working

Plex Players
,
1

I have Plex on a media server laptop and my LG Smart-TV. Both are plugged into my home network LAN and WiFi as well.

I just tried to play a video that went from 1080p to 270p through transcoding. I have this video on a drive I plugged directly into my TV and played without problems.

Since the TV is not the problem, I ask: can Plex not play HEVC/DTS 5.1 videos? I’ve run into this problem several times.

Video data
Home Alone (1990)
10.76 Gb
10-bit HEVC DTS-5.1
1920x1080

Plex data
(about box from app in Windows tray app)
Plex Media Server version
1.29.2.6364-6d72b0cf6
Plex Web app 4.87.2
LG store app 5.1.2

TV data
LG oled55C8PUA

2

Hi, by any chance do you have in LG/WebOS Plex app DTS enabled.

Settings/Video/DTS ( Enable)

3

Yes, I do.

I’ve narrowed the problem down to the server laptop.
The laptop is an Intel Core 2 Duo. I’ve had other server software installed and ran the video without problems.
UPDATE: I discovered the LAN cable running from the router to my TV had a loose connection on the TV side. I unplugged and re-plugged the LAN cable. That solved the problem. Before that the system was running on WiFi only, albeit 5g.
Done.