Hi @daioio,
I used WireShark to do a comparison of the packets received from the latest version of Plex on FireStick 4k and an older version that I know works (8.5.2.20133).
The old version is sending out the following HTTP requests to the server exactly every 10 seconds while playing. The new version is not sending them at all, this must be what is causing the Plex server to time out and kill the transcode.
Can you look into why the Fire Stick is not sending these HTTP requests?
GET /:/timeline?audioStreamID=288174&duration=3600000&guid=plex%3A%2F%2Fepisode%2F5fd092be83c647002e4057c6&key=%2Flivetv%2Fsessions%2Ffe750750-5f63-4aed-8616-ae2c917d5497&playbackTime=5690&playQueueItemID=6.1-1608652800000&ratingKey=121242&state=playing&time=0&X-Plex-Client-Identifier=c2ba770c8a492cb4-com-plexapp-android&X-Plex-Token=xxxxxxxxxxxxxxxx HTTP/1.1
edit:
It also shows up in the logs. Here is a search for /timeline in the fire stick 4k logs with the old version of plex. This same search turns up nothing in the logs of the new version.
The timestamp over to the left shows this request sent exactly every 10 seconds.
