nuthin - 6:13 am on Mar 8, 2011 (gmt 0)
Take a look at your content management system / page creation script and see where it can be improved if these pages are being auto generated on the fly.
It would be of no surprise if you are creating alot of pages even with unique content + adsense on a certain scale that these pages maybe hitting a filter somewhere.
How the pages are being created and structured on the fly (custom titles, meta descs for each page?), internal linking structures, outbound links to more authoritive sources.. just a few things I would be carefully looking at.