I have had my hu for about 3 months,every time I go to receive a call the connection fails.I have an app on my iphone 6 that records the calls,and here is the strange part,the callers voice speeds up really fast on the recording sounding like mickey mouse,although on the live call I can't hear them??One thing I discovered is when I answer my NEX has a little window saying "private ON".....when I turn it to private off everything seems to function as normal.The next call it defaults back to private ON,any way to default it to "private OFF"????

I don't remember a setting for that, but what I would do is see if answering it by the phone changes that.  You might be touching the Green answer and then accidentally keeping it there and the Private On/Off is in about the same place (going from memory)

Private On is basically a "Mute" of the sound

As far as the sped up voicemail, I'm guessing it's the phone.... try reseting the BT on both, and re setup... that also might fix both...

Thanks for the reply,my solution ended up being deleting the call recording software.I assume it couldn't record over speaker,so by default it kept switching over to private mode.

Does the NEX unit require additional modules for Bluetooth like the other Z series did?