Are the pages all original content? It seems pages with not much content or not much original content may be targeted. What is the nature of your site? If it is a relatively new site it may just be resulting from the shuffling going on currently. Keyword tracker shows certain keywords of mine drop out daily, most reappear in a day or two. Shannon
all are genuine contents..... no supplement results its "patent" information site ....the domian is 9 months old
I have seen a few of my sites lose some pages in the last few days, dont worry too much unless it drops dramatically or you are losing any of your ranking/ traffic pages.
timeframe 20st nov - 1 page got delisted (694 pages) 23rd nov - 14 pages got delisted (680) 27th nov - 100 pages delisted (580)