iPhone 15 pro max dropping calls
So iPhone 15 pro max is up to date iOS 17.0.3 but I am using car play in my Ford Fusion with a Anker USB chord and when I am talking on the phone with full 5g AT&T the calls are dropping and or going full mute for prolonged time. This issue never happened with my 12 pro max that I upgraded from. Please help if you have any suggestions. I have hard reset (hold the power) twice already.
iPhone 15 Pro Max