This may be stupid question but how old ate your wipers? Are the OEM or did you get them at an auto store? May be as simple as new wipers

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12 X5 50i Sport
11 M3 DCT
11 X5 50i (lemon)
-- SOLD --
08 550i M-Sport
04 BMW 545I sport
07 BMW X5 4.8I sport
02 BMW X5 4.4i sport
01 BMW 540I M/sport
00 SL500
97 SL500