I have a very early '11 build (7/10) and in speaking with a BMW tech, he was complaining that they have changed the hose clamps on the power steering system. When asked why, he stated that the pressure in the steering system has been increased.
Not a lot to go on, but I suspect the pressure in the steering system has been increased in the past 12 months. Not sure if it helps or hurts your situation, but thought I would share.
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