Would like a clip - perhaps a 10 minute clip and steps to reproduce this
Information that would help
- does it happen with sidecar subtitles or subtitles within mkv or both
- is it on local connections or remote wan connections or both
- does it happen when not seeking forward / back or resuming paused playback?
- any specific Plex Web browser ?
- is it happening with both bundled plex web (accessible through http://127.0.0.1:32400/web or http://ip-of-server:32400/web) and hosted plex web (accessible through https://app.plex.tv/desktop ) ?
I have already seen the post that says it is happening even without automatic quality adjustments
For reproducing the problem - i would need all the settings that are in use for Quality / Debug / Player
and please try to get logs captured soon after the loss of the subtitles - and note down the time please as close as possible to when it happened
For server logs - ensure debug logging enabled beforehand
see https://support.plex.tv/articles/201643703-reporting-issues-with-plex-media-server/
For Plex Web logs, please enable verbose logging beforehand
See https://support.plex.tv/articles/201611836-plex-web-app-logs/
If it is XBox see https://support.plex.tv/articles/206239048-xbox-one-logs/
and to capture the logs when the problem arises
For Plex Web/XBox One see the articles referenced above
For the server see https://support.plex.tv/articles/200250417-plex-media-server-log-files/
For providing the clip - if it is an mkv you can use tools such as mkvtoolnix to get the first 10 minutes of the video
See https://support.plex.tv/articles/201035968-generating-sample-files-from-media/
