Here are the details about how to grab server logs and you can upload them right here in the forum post (hit the upload button): https://support.plex.tv/articles/200250417-plex-media-server-log-files/
Run the video that has the problem - let it flake out… wait a few minutes and then grab the logs from the server.
These forums sometimes automatically create hyper links to common pages so you probably didn’t notice it automatically linked your phrase “server logs” to that page - that’s easy to miss (did it to mine in this post too). They do that with a few of them - like Plex Dance you only have to type the phrase and it links to the info automatically… I didn’t create that link. It’s easy to miss though.
It can also help if you grab the media info from the “view xml” option and post it here (click the 3 dots to get the sub menu and choose “get info”):
You can also create a test file using one of the files that has the problem but might be best to wait and see if someone asks for it: https://support.plex.tv/articles/201035968-generating-sample-files-from-media/ or at least
