what phone do you have? I have a pixel XL and similar symptom. I've heard of other folks with this phone having Bluetooth phone audio issues ever since the newest OS update. My phone worked fine with the stinger and other vehicles...now bluetooth works in part by transmitting an incoming our outgoing call data to the screen, but the audio from the call is not heard by either end. This is a problem with the phone, not the car (at least in my case). I've confirmed this behavior in other cars as well as successfully using a different phone in the stinger. I've done a lot of troubleshooting and before I do a factory reset I'll see what the november patch brings as I've already reported the issue to googly. hope you fixed your issue