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. Once I pair it with a car, in BT settings, there is a button that says phone mode but it will not select. When hitting the selection box, it fills in and then goes right back to empty. Screen shots below for reference. Thanks in advance for the assistance.