bluetooth call quality??

[drcap]

When my wife calls me from my 07 4.8i e70, with iphone 3gs, she sounds like she is talking with the windows open but everything is closed up??? . Has anyone encountered this type of this wind tunnel like background noise or heard complaints from your callers about background noise when you are talking to them over the factory bluetooth. Just was hoping there might be a fix for this. Because when I am driving the interior of the car is never that loud. Thanks all. Oh ya just today i noticed that the sound does quiet down when the car stops moving (she was at a stop light and there was much less background noise but still some). This is realy weird .