I'm hoping somebody can help me figure out an intermittent issue I'm having with my model X. Occasionally, every quarter or half mile but not consistently I feel a slight vibration in the steering wheel that lasts for approximately one second. It is similar to the rumble strip on the edge of the freeway. But not as strong. I spoke with a friend of mine who has a model S and he said that he has felt the same thing occasionally in his car. I haven't had a chance to take my car to the shop yet and I'm just curious if anybody out there has had a similar problem.