iphone 4 using audi bluetooth module (q7) worked fine until upgrade to new operating system (5). now works fine on car startup; iphone is paired, address book visible, no issues. but as soon as a call is placed using hands free, or an incoming call is accepted, bluetooth cuts out after five seconds and call reverts to iphone itself. then while using iphone, bluetooth comes back on, cutting out iphone conversation momentarily before coming back on speaker. this happens every time without fail. apple suggests 1) restoring iphone to factory settings, or 2) checking with audi for a firmware update. former option no guarantee of doing much other than losing information; latter option is likely to be a wild goose chase trying to find someone at audi knowledgeable enough about compatibility of their bluetooth module and iphone operating system. far more likely to be a bug in the new iphone operating system. apple, hello?