For some reason I my headset no longer works phone calls. I can't hear the caller and the caller can't hear me. However they still work for everything else. I can give voice commands over Siri, Speech to Text, listen to music and get navigation information. What could be causing this? I have tried setting the audio device to bluetooth headphones in accessibility. I have rebooted multiple times. Switching audio devices back and forth doesn't work during the call. They have also been deleted from my BT device list and paired again. The main reason I bought these was for hands free calling while driving. They worked great for calls. Then for some reason they suddenly stopped.