Conversion failed. The transcoder exited due to an error

Have some questions - the transcoder failure I mentioned was actually a transcode for sync that got killed off. Do you remember what happened?
The sync was to Miguel iPhone for the tv episode mentioned earlier and the transcode started at Jun 22, 2018 16:50:49
The transcode job was terminated at 16:55:19

Jun 22, 2018 16:55:19.675 [28473] DEBUG - Jobs: '/data/user/0/com.plexapp.mediaserver.smb/Resources/Plex Transcoder' exit code for process 20896 is -9 (signal: Killed)

Was it hung and you killed it off ? Do you remember ? and was it this transcode that you saw failing?

Is sync using mobile data or just wifi ?
I can see relay connection failure at the time