The Bluetooth has worked very well for the past year, - until just yesterday. All of a sudden, it stopped, during the middle of a phone call. And even though it said it was connected on the phone's screen, the Camry's screen said it was off and would not connect or even allow anything to be changed. After stopping the vehicle and turning the entire car off and back on, the Bluetooth worked again. But then later, it stopped again. Why is it cutting out?