They mean the lightning/USB connection with the car (for hands free and music).
I'm actually thinking this is something that is pushed to the device after the OS load, as downgrading to iOS 11.0.1 fixed my problems. Then I spent many hours creating all of my customizations (reloading apps, etc), now the problem's back. I can't see how app data would impact the USB connectivity.
More testing required to confirm....(going to restore the original 11.0.1 backup).
Edit: Actually, I rolled back to 10.3.3 (as I was still allowed to and have a 6s). Can't take the chance on putting 11.0.1 back on and then whatever setting is causing this dysfunction being pushed to the device again.
Stuck until someone reports this as being fixed (not holding my breath). Also means no new toys until it is....not swapping out my car this year.