a lot of us are suffering with this issue. Think its more to do with incompatibly of bluetooth versions of software. I was hoping with the latest update of android 4.4.3 which has bluetooth updates would solve the issue. It didn't
The manual is on here. A downloadable pdf or you will find it in your car manual depending on age of car
http://www.350z-uk.com/topic/7742-manual-oem-bluetooth-phone-manuals/