Seems like I found some hint what is happening: I found via Webdeveloper options that "LB Radio is temporarily unavailable. Please try again later.", code: 503

The issue is happening since at least yesterday. Because of this issue, no radio I tried works, including artist radio.

I am a new user, so maybe I am also having issues because of that?

Also, on the website itself, there is no (proper) error message, the loading spinner just spins for about a second and then nothing happens.