Sometimes when I want to listen to a music that I haven't listened recently, I couldn't found it in my library and when I search for the song, it stills in Spotify and I have to add the song again in my library.
It occours more than one time, I search a music that I added in my library and it's not there anymore.
Solved! Go to Solution.
To avoid this problem, make sure nobody else is using your spotify account. It's also quite helpful to add songs to playlists. Sometimes saved songs tend to be buggy, but playlists are solid.
I hope this is helpful.