blue tooth

I have a Moto X Pure - stock - and it will no longer connect BT phone mode to any car. It worked until about 2 weeks ago and then it just stopped. It will sync with the car and I can play audio from the phone, but no calls will work through the systems in the cars - 2 audis and a chevy truck...

As soon as I got Verizon's update, by Honda (2013) and my phone don't get along nicely. It connects , stays connected for a few minutes, then disconnects. Reconnects, loop forever. If by chance I do get phone call while it is connected, the sound breaks up we can't hardly understand each other...