The Conversion failed. The transcoder exited due to an error is a generic general issue and may arise due to many reasons. The specific errors that seem to come on when the windows bad update was applied were these logged errors
ERROR - [Transcoder] av_interleaved_write_frame(): Unknown error
ERROR - [Transcoder] [dash @ 02b0d8c0] Unable to open http://127.0.0.1:32400/video/:/transcode/session/xxxxxxxxxxxxxxxxxxxxxxxx/manifest for writing
If you continue to have issues even with applying the windows update to Build 17134.167) , then as stated before, please provide diagnosticss
See
https://support.plex.tv/articles/201643703-reporting-issues-with-plex-media-server/
https://support.plex.tv/articles/200250417-plex-media-server-log-files/
There is already a topic on memory issue. I am waiting for logs and a file that actually brings the problem on so it can be reproduced and investigated.
I will have a look at your thread and link to the existing one