My server is constantly refreshing its libraries. I checked the logs, and it is picking up changes in my media folders that shouldn’t be changed. This started recently, but I am not sure if with an update (though - probably).
As of PMS 1.32.0, PMS is now more sensitive to filesystem changes.
Are you using a download client which writes to the directories PMS is monitoring?
( This is the usual issue )
PMS 1.32.0 and above is now sensitive to permission changes (chmod). If you have any sort of automation which fires periodically and shotguns the permissions for your media, PMS will see this and rescan everything.