I was thinking back on this. Earlier in that week, it rained pretty hard. Those of you who know Norfolk, VA know that it doesn't take too much rain to turn some road sections into rivers or lakes. I drove through and on some petty "wet" streets and while it wasn't over the hood or even up to the hubs, I could see how some moisture might have made its way up into the intake. In any case, it hasn't been an issue since.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim