Just an FYI, a couple buddies had problems with their iPhone and AVIC NEX units.
From CarPlay never kicking in, to the unit not recognizing the iPhone, to things dropping off while driving.
In each case, a new cable fixed the problem...please see:
http://avic411.com/index.php?/topic/39772-carplay-issues-please-help/?p=286393
Hope this helps!
Don