Just wanted to add a +1. Error occurs when scanning the libraries. I had it set to 1 hour intervals and now have it at 12. I opened my own post before seeing this one.
I have tested going back and forth in my scanning intervals and it is clearly the scanning that is causing it.
The error that I am getting has also been reported to be an issue with windows exhausting the default ports or being on the wrong default ports. I have checked these as well, but do sometimes get an event in Windows Event viewer at the exact same time as I have errors in PMS. This happens approximately half of the time that I have errors.
Here is my post, but I am going to keep watching here as well.
Other Post
While it has been suggested to roll back a version or two, I would rather not do that as it doesn’t really solve the problem and instead just keeps me on an old version. With the scanning turned to every 12 hours it drastically decreases the error rate and allows us to continue to work on it.
Thanks to all the Plex Team Members for the help!