Seems to me an android or Samsung issue, not app. I uninstalled Pandora and tried several other music streaming apps as well as just a music player and they come on after rebooting the phone also, whichever one I opened last is what opens it reboot. It's not related to just Pandora on my phone. But it is very freaking annoying lol. And I have a Samsung Galaxy s21 Plus by the way.
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