Audi A8 L or A6 L gps interference.
Many people had an issue related to the iphone's gps while driving the audi a6 or a8. I would kindly recommend to remove the metallic tinting from the windows of the car as it interferes with gps or the radio and replace it with ceramic. iPhone whatever series it is, works fine and the Audi's as well so no worries problem is solved.
iPhone X