This happened to me in the SDL ~6 months ago after HAMMERING over a LARGE pothole. A quick tap of the brakes remedied the situation. After explaining in detail to my competent mechanic, he stated quite matter-of-factly, "balance the tires". The problem has not returned.
'04 ML500 - 53k, Inspiration Edition, Desert Silver
'11 Audi A4 Avant - Brilliant Black
'87 300SDL sold
'99 C280 Sport sold
'85 190E 2.3 sold