That sounds like the general symptoms that lead to the rise of the “Plex Dance.” This is a workaround for a long-time problem with Plex’s metadata agents, where they wouldn’t pick up changes in metadata. The music scanning agent recently underwent a major upgrade which pretty much eliminated the need for the “Plex Dance” in Music libraries. The agents for other Library types will hopefully soon receive the same improvements, but there’s no indication of when that will happen.
