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I finally took it to a different service center (at Burlingame, CA). Within 1 hr after I dropped the car off, the tech called me from my car driving on the freeway and the call quality was flawless. They had replaced the microphone(s) which did the trick for me. Since then I haven't had any...
My MS was Dec 2013 delivery and I am going through Bluetooth quality issues too. When I am driving slow (not on highway) it works clearly, but once I get on the freeway, the quality fades to a point that EVERYTIME the caller on the other end cannot hear me at all.
Couple of weeks ago took it...