FaceTime from OSX (MacBook) frequently cuts out my voice for the listener
FaceTime calls from my MacBook (OSX 10.9.4) to an iPad / iPhone frequently drops out my microphone audio for the other party, they report that the video is still fine when this happens (suggesting it's not a network issue) and that the audio for them keeps dropping, yet I can hear and see them fine. It's really frustrating when they keep looking at me blank and asking me to repeat myself.
I'm calling from Spain back to the UK, I have a 100mb/10mb fibre connection and the other side has 24Mb/1Mb ADSL. I previously had 10Mb ADSL and had exactly the same problem.
The problem does not occur when I call them using my iPhone strangely, suggesting a problem on the MacBook.
On the last call I ran the Quicktime recorder during the conversation, the other side of the call reported the same audio drop outs, after the call I reviewed the recordings which were perfectly clear with no drops, proving the microphone of the MacBook is fine (which Apple recently replaced as they believed that to be the problem).
So points to the FaceTime software perhaps for OSX which there are very little settings for? Has anyone else had this issue and have a fix?
I've tried turning off the 'Use ambient noise reduction' flag in Settings > Sound > Input in case that was playing some part in it but made no difference.
MacBook Pro, OS X Mavericks (10.9.4)