After much frustration with this same issue, turning off everything in pandora and my phone, i have found another place that was the culprit. Android installed an app that isnt in the list, that you can only get to by clicking on the 3 dots to the right of the open pandora label on your (open apps) screen. The one after logging in that tells u notifications. After messing around in there and turning off everything i could find, it finally stops the autoplay but still allows for me to play on the bluetooth when i choose. And doesnt keep reopening when i close it down. How to get there, i could not retrace for you. But k ow if you have done all you can in pandora and your car apps and phone apps, there is one more place android has provided for your frustration.
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