There isn’t any “Premium Music” anymore per se. It’s all “music” now. That transition occurred several versions ago.
I will need to see DEBUG log files (the ZIP) which capture this.
Given music tends to consume all the notification slots on Linux systems easily, I very much would like to see PMS restarted in that log set. It will allow me to verify if this is simply a kernel table limit or not so we don’t waste efforts in the wrong area.
