It was happening to me a couple of hours ago but appears fixed now.
Fred Greco
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Yes. 15.4 beta 3 has been a complete mess for me. Bluetooth connections are not working. I can't get CarPlay to work unless I reboot my phone - every single time I get in the car. Wired CarPlay is not working either. My Echo Auto will not connect either. I can't wait for the next update. I've never had such problems with a beta, even the initial builds.