Hi, I have a premium account and there is a problem with the artists I follow.
Most have disappeared from my list of Artists and only appear a few. I was also the case in the iOS app.
Why the artists I'm no longer appear?
I suggest you contact support so they can help you https://www.spotify.com/about-us/contact/contact-spotify-support/
If you get an automated reply email telling you to check the help section or the community, you need to reply back to it.
Support usually replies within 24-48 hours.