NomadMan - 7:47 am on Aug 20, 2012 (gmt 0)
They've a leaky bucket and haven't a clue how to repair it.
With the huge amount and still growing adspace available to Adsense, delivering relevant ads with strict filtering & ranking.......is out of control due to the continuous tinkering.
Once the site ranking / filtering system starts lagging, Ad delivery goes haywire.
Press reset - recalc ranking, wait 2 weeks to resettle.