Beta 2 seems to have fixed the issue on my 11pro max.
rhass
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I Have a 2019 Honda Accord and a 2019 Mercedes SL. Carplay was working perfectly in both cars until a few bea beta released ago when Waze and some over the air music selections working play. The Waze app worked but I lost voice directions from it. It always worked perfectly in the Honda. The Accord in2019 has a different audio System than the Civics do. Anyway On my phone under Settings/CarPlay I removed the Mercedes. I then connected the cable in the Mercedes and slowed it to unlock the phone. It seems to work more. You guys may want to try removing the vehicle and then connect to it again. I know it's a low tech simplistic suggestion but it seems to have fixed my issue. I'll update if it fails again. ( Sorry for the comically ignorant wording. I blame my ipad floating keyboard swipe. I've Given up correcting because it's funnier just to leave it as is!)