Saving Metadata

I have an SSD in my RS520. I have a lot of music imported to the SSD. The metadata is either gone, going away, or applied to the wrong files/artists. It use to be perfect. How do I keep the metadata applied to the files? This seems like a really old computer problem.

I remember having an WD movie player box where it gave AV connections and computer connections. You could rip your own movies and put them on this player and you would have a nice interface to control it all and central storage for a large quantity of movies. It use to lose metadata too. That thing was from sub 2010. So 15 years later and metadata is still getting lost on hard media?