I also just read about this from a recent post, but my issue is that my 2018 Chevy Impala keeps disconnecting from my iPhone 11 Pro Max. Or the phone disconnects from the car.. Can't really tell. BUT, Music will continue to play thru the car stereo when the CarPlay Display shows as disconnected (there's a placeholder screen on the stereo prompting to connect a device), and after a few minutes it'll show the CarPlay display on the Stereo again. But then disconnects after a few minutes.. Rinse repeat.
However many updates ago, I was experiencing BlueTooth drop outs, too. Not just for my car, but with a pair of headphones and a BlueTooth wireless speaker. Those issues seem to have been resolved, though. Not the CarPlay Connection issues. I'm wondering if it's really happening to more people than what these forums indicate. I've tried a brand new cable, but not seeing any change. I wonder if people are just used to how many bugs there's been lately, they just assume it's something else that's broken and move on...
I saw this post hoping for a solution to my issue, but it seems I'll have to keep looking. I've already contacted my Dealership. I've tried resetting my Car's stereo. Forgetting my Car in Settings/General/CarPlay.. I've restored from a backup and restored and set up as new. I'm just accepting it won't be fixed at the moment.