iTunes Library keeps deleting itself
I've got iTunes 12.8.0.150 running on an HP-brand Windows 10. Every week for the past four months, sometimes twice a week, my entire iTunes library deletes itself. The files themselves still exist in the iTunes folder, but they are no longer represented in the program itself. This includes songs, podcasts and podcast subscriptions, films, and TV shows.
I have logged out of my Apple account and then back in, and have reauthorized my computer. I keep a copy of my library's .xml file backed up so I can restore the library, including playlists, but even then, I have to re-subscribe to podcasts and re-sync all the files (including photos) to my iPhone 7. What is going on?
null-OTHER, Windows 10, HP-brand laptop