Hey there and very warm welcome to the Spotify Community :)Thanks for your question.
Spotify albums or singles can be removed with some reasons:
- Artist choose
- Label choose
- Deal with distributor ends and not renewed
- Album incorrect, wrong info, bad sound, usually in this case just take down and will be reuploaded
- Other stuff like copyright issue
Spotify never remove tracks by itself.If any problems with Spotify in future, just come back and let me know. I will help you.Greetings,Jyrziu xd