Use MKVToolNix to remux the file. This strips streaming metadata and often fixes playback glitches on TVs or Plex.
: When an MP4 file fails to play, it is often because the metadata atom (the part of the file that tells the player how to read the data) is missing or corrupted. Tools like Untrunc are frequently used by "nippy" or tech-savvy users to recover these files by using a working reference video. nippy user since 2015 mp4 fix