Bingo Tanner! It was Apple Music. It never did this until I upgraded my Verizon plan to a higher level. Unbeknownst to me, That plan came with unlimited Apple Music. I started to suspect it wasn't Pandora because some tunes that the apple app was playing were songs done by some of the contestants on The Voice. Digging deeper, I found that the Apple app auto-connects with the car's bluetooth, just a Pandora does. It's just a matter of who connects first, and usually it's Pandora, but occasionally Apple beats it to the punch. So when I launched Pandora to see what it was playing, it actually superceded Apple and started playing the last station/playlist that I was listening to. It was driving me nuts for about 6 months (because it didn't happen very often). Case closed!
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