Was a 5, still broken after many months

Trying to find out why it is having so many problems now. It plays the wrong song when I click on a song to play, but usually plays the same wrong song, and then the app locks up. I have to close it and go to the Apple Music player to stop the wrong song playing. Other apps have no problem playing my music, and play the Slackstring song just fine. For example, I click on a particular Slackstring song, and it plays Nirvana All About a Girl, every time. Will not play the Slackstring song ever. Playlist not now working properly either. I have deleted Picky and reinstalled and also removed and reinstalled all my music collection from scratch. This was around the same time as the Apple Music update, which I have disabled to sync.

Macrm114 about Picky Music Player