So. I have been talking to apple for about 3 days about this over twitter, I have a brand new Kia Sorento GT line S which with my iPhone XS Max worked perfectly, the problem I was having was/is, that calls were dropping and being cut short, if my series 5 watch was connected to my phone, then whenever I was in my car or at home or out and about my phone would only vibrate with nothing happening on my apple watch, it didn't even recognise I was getting a call and it just stayed in standby, then the phone would cut the call before I could even answer it, also while I was in my car, if I got a call, my ringtone sound would not come from the speakers, I would only know I was getting on because the speakers would mute and the infotainment screen would show the number calling, Bearing in mind I have had no issues With any speakers I have, UW Boom, Harman/Kardon LG etc, including my AirPods or beats, apple messaged me today telling me about 13.1.2 so I updated to that, while it did solve the iPhone connecting to the car, staying connected and sorting out the ringtones, it did not sort out the messages, I'm not the biggest fan of car play so don't really use it for short journeys, only for road trips, and I stream my music, which always worked fine with my XS MAX, ask Siri to play whatever and it worked, all of that is gone now, Siri tells me I have no music and also Apple Music needs to be on my phone, which it is, but the biggest pet peeve is messages, my car would tell me I had a new message and I could get it to read me my messages, now it doesn't work at all,. if I go to the message settings on my car it tells me its connected but it doesn't work with the new iPhone 11 pro or the iOS 13 various updates, I've reset my phone, and also reset my infotainment system, and it works for about 5 messages and now works randomly, but out of about 10 messages, only 1 gets displayed or read aloud, which is very frustrating, Im lucky though mostly everything else is working, and the phone seems to be working for calls over bluetooth now.. it was for only 2 calls mind, but hey ho, I hope we get another update that solves everything for this Very expensive but awesome phone,