Most (including LG) TVs are limited to 100 Mbit connections.
The last update was 15 days ago: Plex for webOS 3.0+ (LG Televisions) - #49 by markus101
Based on the logs the trailer is a 480p H.264 video with AAC audio, which is supported by webOS 3.5 and is working on my webOS 3.5 device. For some unknown reason the media player on your device is failing playback with error code 4, with a message about the codec.
There are some differences between our devices, mine is only 1080p and running a different software version, but a software update from LG shouldn’t have broken one of the most common video/audio combinations like you’re seeing and it’s not possible for us to update the Plex app to avoid those codecs.
At this point there are a few things to try (along with re-testing the app):
- Ensure there isn’t a new update
- Do a factory reset of the TV
If you’re still experiencing issues, create a sample of a video file that used to play, but no longer does: https://support.plex.tv/articles/201035968-generating-sample-files-from-media/
If possible try loading that file on a USB drive and playing it with LG’s Photo & Video app.
If you can reply with the results of these steps as well as providing the sample we can review it further.
