HTC One call cannot be terminated, why?

A

AC Question

HTC One call cannot be terminated

I think this happens when using phone with the Citroen BT Radio and the signal level drops to nothing. The call is not disconnected but the connection is lost (and disconnected at the recipient).

Trying to end the call results in the phone showing the call as ended but the car set showing it still connected. Disconnecting Bluetooth link doesn't help. Trying to call again either results in "Call not sent" message or failing after 15 or 20 seconds, often with an ear splitting beep. It is also possible to end up with the display flashing on and off.

The only recovery requires rebooting the phone.