netmeg - 1:07 pm on Nov 6, 2011 (gmt 0)
The fact that it's happening to so many is probably a good thing; the possibility is greater that it's some kind of error. It might not be, so don't get your hopes up yet, but I'd go over to the AdSense Help Forum and if there's not a post over there already, start one, and see how many chime in. At least Google reads that one.
They knocked about a hundred bucks off mine in July, which is the largest amount they've ever taken by far, but it's also the largest earnings month I ever had too, so I figured it was just part of that.