Hi, just adding here for tracking, understanding it is very early in iOS 27 lifecycle, I have Dev beta 1 of iOS27 and CarPlay is unusable, it disconnects constantly and eventually doesn't connect at all until next drive.
Hopefully it's an iOS bug that gets better over time but just wanted to put it here for tracking in case. I also get messages on the screen that Wifi Connection is unstable right before it disconnects.
I'm having the same issue with the actual iOS 27 update with the new iPhone 18. I've reached out numerous times through support and have not gotten any response whatsoever. My unit is completely unusable. I first see that the wifi signal is not strong, the screen freezes and then it disconnects only to re-connect to my phone. The cycle continues every 30 seconds to a minute. Restarting does not fix it. I was thinking I had a bad unit until I saw this post. Many others must be having the same problem. - Posting this as a new topic if I can as well.