I’m on mobile also, and I’ve had a similar problem but not just with any outside music application, with the in-game music cutting out as well. Idk if it will work, but you could try to disable the in-game audio through the in-game settings or maybe even your device settings if it supports it, and see if that lets you play your music. If this doesn’t work, it probably means that there’s a bug with the music app and the mystera app just not correlating or something. Does your music ever cut out when you are using any other apps? Or just this one? I myself have resorted to using my phone phone for music/YouTube, and my tablet for mystera. Hope this works, or the bug is fixed.