I'm having the same issue on my unlocked Pixel 4a on Verizon. My Premium account just started playing by itself, as it has been doing for a few weeks at least. I had just cleared all notifications and apps, locked my phone and set it down, and then not even 1 minute it started playing music from Pandora. I often pull out my phone out of my pocket to discover that music has been quietly playing in my pocket for who knows how long. I thought it was an issue with my old phone, but since getting the Pixel and discovering this, it's clearly related to the Pandora bug. I'm running Android 10 and Pandora 2008.1 I often use bleutooth headphones (Taotronics SoundSurge 46) and my car's aftermarket (Pioneer S600BS) but both are off and out of range often when this happens.
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