I have the same problem...I think it comes from the mirrors, but is worth checking the seals. I will ask when i go for the SW update.
Let us know what your dealer said.
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2011- : BMW 116i (F20)
2009-11: BMW Z4 2.5si (E85)
2007-09: Mini Cooper S (R56)
2005-07: BMW 325ti (E46)
2004-05: BMW 318i (E36)
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