Hi @Missthing20
Welcome to community!
To clarify, Pandora will interrupt your stream with Audible and begin playing when connecting to your vehicle? Could you confirm if Pandora was playing before listening to Audible or in the background?
Do you only connect your mobile through Bluetooth or do you connected to Android Auto?
In the meantime, let's try disabling the Launch from Car feature to see if it help. From the Pandora app, visit Profile > Settings > Advanced > Under Bluetooth Devices > Ensure that Enable Launch From Car is toggled off
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