Based on the info you provided us with, we still believe that this is an issue specific to your account.
As a result, we suggest you create a new account, and then reach out to our Customer Support team here. They will be able to help you out with transferring all your saved music to the new account and then closing the old one.
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I have the same issue, which seems to randomly show up with artists I have listened to for years (as a premium subscriber). I have never blocked any of the artists this has happened to. The two I recall it happening with are Ministry and My Life with the Thrill Kill Kult. If nothing else, it would be great to see a list of blocked artists so that we can edit it and unblock them.
Edit: Adding some more I have found to see if there is any connection: Front 242 Laibach