This machine's user is set to auto-log-in. Screen saver, display sleep, power saving: all set to never, as they always have been.And with macOS 15, about every 12 hours, it locks the screen. AND unmounts the external drives!! Since it's going to take me a while to downgrade this motherfucker, if anyone can tell me how to make it stop doing either or both of these things, that would be great.