My Release Radar playlist used to refresh every week with brand new songs from my favorite artists, but recently it has been showing me a) songs by artists I don't follow and b) songs that have been on the playlist for weeks at a time.
For a) the algorithm seems to match releases by artist name even though artist profile would be more accurate. For instance, the two artists named SiR below are clearly different.
For b) songs that have been on the playlist week after week inherently aren't new releases updated every Friday.
Seems like it should be relatively easy to fix erroneous artist matches and old songs, and it would materially improve my experience on Spotify.