Plex introduced an Auto-Sync Subtitles feature that aligns subtitles with audio using an algorithm that detects voices, supporting external SRT files and those from OpenSubtitles.com.
The feature requires a Plex Pass subscription, voice activity detection, and media analysis enabled on the server, but won’t work on some systems like FreeBSD, Nvidia Shield, and certain NAS servers.
Plex is expanding its app offerings, including a new dedicated photos app in open beta, and currently offers a 20% discount on Lifetime Plex Pass subscriptions.
I have had similar issues with Plex on my Nvidia shield. Changing the audio track often helps