This has been happening to me for a couple of months now where the “Plex DLNA Server.exe” process is constantly growing and abnormally high CPU usage (10-25% on a 4 core machine). I’m looking through the logs (atttached) and I am seeing activity happening when no client is connected or searching… that I am aware of anyway. I do have a Windows 10 PC on the network at all times, but have never used it as a client.
I end up having to kill that process and fortunately Plex restarts it, but it will grow and use every last byte of memory until I do so again. I’ve been through quite a few revisions of software which this occurred with and just updated again. The logs I have attached is on version 1.9.2.4285