Had this problem with my MY08 x5.. Dealer changed all 4 light housing under warranty. My 2011 has not had this problem

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Ordered 5/10/10 - 2011 X5 35i Saphirre Black with Cinnamon Nevada - SAV Trim
-Comfort Access
-Tech Pkg
-Convienence Pkg
-Cold Weather Pkg
-Active Cruise Control
-High Beam Assist
-Comfort Seats

Replacing 2008 X5 30i Saphirre Black with Tobacco Nevada