Seemingly randomly, Plex will decide that about half of my existing movies are "newly added". It will redownload all the meta-data and add them to the Recently Added list. These are movies that I've had in my library for 2+ years, and it is really frustrating to suddenly have 200+ old movies suddenly crowding out my actually recently added items.
I've been having this problem for a while now, and have never figured out why it does it or how to stop it. I'm running the latest PMS on a Mac Mini (running 10.11) with my media stored on a NAS. The mounted drive never drops, and nothing changes with the media itself.
Anyone else have this problem and hopefully know how to fix it?