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I had pages from two different sites dropping out of the index (at the same time I noticed a huge decrease in traffic), that was the situation after submitting sitemaps in Webmaster Tools.
The one of my two sites where (at the time) just about 6 months old and had a good, increasing traffic, until I decided to submit a sitemap in Webmaster Tools. After submitting the sitemap, pages began to drop out of the index and traffic decreased by 50-60 percent.
Within a week after removing the sitemap from Webmaster Tools, traffic slowly came back. Within 2-3 weeks the dropped out pages began to show up in the index again. I didn't made any radical changes to the website at that time, so I'm pretty sure that it was the sitemap submition that had caused the problems.
Today, both sites are doing very well -- without having any sitemaps submitted, of course ;)
[edited by: OutdoorMan at 1:22 am (utc) on April 27, 2008]
I just don't get why G isn't crawling all of my pages
Are you sure that googlebot isn't crawling? Or is the issue rather that the pages are crawled but not yet in the index? There are two seperate steps involved.
At any rate, note this thread: Googlebot crawling down 75% across multiple sites [webmasterworld.com]. During the past month, it seems that Google's been busy using it's computing power in other areas. I just goes in cycles.