[mellyrivvsbmw]

I have a 2005 BMW X5 that has given me no problems with the exceptions of the past 5 months. The problem is my steering wheel shakes (usually on the highway) but it doesn't shake all the time. I've taken it to BMW to be checked out multiple times and they say everything on the car is fine and when they test drive it, there's no shaking (figures, right?). Tires have been rotated, suspension and alignment have been checked, what could it be? Any ideas on what I should mention to the guys at BMW next time I bring it in?