Can you connect from your phone to another BT device, not the car? If you haven't ,I'd try a reset of the phone by holding the home and power button down. Next step would be to talk to your dealership and see if they have any ideas. Sometimes software can either get updated on iOS or on the vehicle and it can cause problems. Every dealership seems to have a go-to person that handles issues like this. Getting to know him or her well and getting their direct phone number will pay big dividends. A device restore might be necessary, but if it were me I'd talk to the dealership first.