I've got a new T6 Kombi with the Discover headunit and CarPlay and an iPhone X, I get a constant connecting to usb/disconnecting usb message.
It actually connects and works about 1 in 5 attempts, no matter what sequence I use to try and initiate a connection.
I've tried plugging the lead in first, then turning on the ignition.
I've tried unlocking first, then lead, then ignition.
I've tried ignition, then lead.
And every other combination you can think of.
Every now and again it works first time for no reason.
It's not the lead or socket, I've tried a 7 and an 8 and they work first time every time.
Very frustrating, flagship phone, flagship headunit and yet they don't play nicely together.
Come on Apple sort this out, I came away from HTC as I wanted a more stable environment and I'm starting to think it was a mistake.