I tried charging yesterday my Bz4x at an MFG charge point and it failed several times.  Eventually with the help of the phone guy I charged it by holding the very heavy cable/plug combination into the socket long enough for it to connect.  I've charged successfully before without doing that.  Does anyone think there might be a tolerance problem with the communication contacts in the socket, which the guy suggested might be the problem, with the heavy cable pulling down lightly on the plug?