I can see one failure here
Mar 23, 2021 01:05:16.120 [15880] ERROR - [Transcoder] [tcp @ 00e78980] Connection to tcp://192.168.0.105:5004 failed: Error number -138 occurred
Mar 23, 2021 01:05:16.121 [15880] ERROR - [Transcoder] http://192.168.0.105:5004/auto/v11.1: Unknown error
Mar 23, 2021 01:05:16.125 [11808] DEBUG - Jobs: 'D:\Program Files (x86)\Plex\Plex Media Server\Plex Transcoder.exe' exit code for process 11760 is 1 (failure)
This type of failure has been seen when windows runs out of dynamic tcp ports
Can you open windows Event Viewer and select Windows Logs and then System and then filter on Event IDs 4227 and 4231 and see when those arose
It tends to happen when scanning large libraries Movies, TV Shows
Upgrading libraries to the latest native in-line scanner/agent mitigates this as the scanning is in line and not in separate process. Also a fix to a curl bug will help reducing port usage by 66% - this is not yet in PMS and is expected in version 1.23.x. Also reducing the frequency of periodic scanning reduces the chances of running out of TCP ports impacting other tcp actions such as communications between the transcoder and the plex media server processes
See this article for making sure movies libraries are upgraded to the new in-line scanner Upgrading a Movie library to the use the new Plex Movie Agent | Plex Support
For TV Shows - the new scanner is still in beta - see [BETA] New Plex TV Series Scanner - Plex Media Server / Metadata & Adding Files - Plex Forum
For Music libraries still not updated to the in-line scanner see Upgrading Music Libraries to the New Metadata System | Plex Support
