I think this is a Bravia-specifi Plex issue: H264 movies do not play
I’m seeing the same issue on two Bravia TVs. Plex for Kodi and all other clients (including Android on tablets and phones) are fine.
The issue is that content loads to a blank screen, and stays that way. Sometimes I get an error about the server not being available. Even more rare, the content will sometimes actually play.
I think the issue started about 6 or 7 days ago; we just immediately switched over to good old reliable Plex for Kodi until I had time to investigate the issue. I’ve since rebooted both TVs and even reinstalled the Plex app on one of them; no dice. Also restarted PMS.
