It could be a os 4.1 issue. I know that each manufacture(auto) implements the bluetooth stack the way they see fit. They do have a guild line to follow but there is always room for interpretation. So it would not be out of the question for the bluetooth to work fine with one car and not the other. I would ask your SA to check for an SIB out on this. Or you could just call him/her from your car and see what they think of the quality and if they feel there is an issue.

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2012 X5 50i ZAP(2VA, 336, 465), ZTP, ZPP, ZPS(6VC), ZCW, ZRC, 322, 4UB, 4NC, 610
2011 ///M3 Silverstone II
2011 X5 50i(lemon)
-- SOLD --
08 550 Msport
07 X5 4.8I sport
04 545i sport
02 4.4i sport
01 540I M/sport
00 SL500
97 SL500