I had an issue on Friday with the HFL. Was using it and stopped for gas. After fillup, I tried to make a call and apparently the phone wasn't fully linked. Hung up. From then on, car and phone acted like they were linked, but when I initiated call, I could not hear other party and they could not hear me. Had to use transfer to get it back onto phone. Tried several calls with same result.
Pulled over and rebooted phone and turned car off. Restarted and tried calling - same result. Thought I didn't wait long enough so turned car off again and waited several minutes before restarting car. No luck same result. Resumed trip not being able to use HFL.
Issue went away next day after sitting over night.
I'm assuming its a reboot issue as power to HFL must stay on for some time after turning car off. I know it is more than a couple minutes.