This is just a guess, but maybe it's something to do with the change in Google that has led to no more "supplemental results". Perhaps they threw out the authoritarian junta-style approach to ranking management and have opted for something much less punitive but much more volatile.
Just a guess. I haven't had any change to rank, but I have noticed that pages get listed quickly, stick around a month, then go down, go back up later, etc. As you add more pages, it gets them all, but seems to go round in cycles when it comes to making them available. And they do come back, round and round in circles.
I have no idea what's going on there. However my experiments all came to a sudden halt when I accidentally thought my server had gone down owing to not paying my bills, when it was just a technical fault. Completely unnecessarily I let 3 weeks go by because I had other work I was more interested in, so google found all my pages to be dead. However before I use the webmaster tools to get google to put everything I want back online, I think I am going to thoroughly upgrade and clean up my content.
Wow, I like Google's webmaster tools. Cheers for that.
Quote:
Getting Google’s view of your site, and diagnosing potential problems
The first step to increasing your site’s visibility on Google is learning how our robots crawl and index your site.- Crawl info: You can make sure we have access to your site, and see when Googlebot last visited. You can also view URLs that we’ve had trouble crawling and why we couldn't crawl them. This way, you can fix any problems preventing us from indexing all of your pages.
- Robots.txt file validation: See if we’re having trouble with your file, and test out changes to that file before you change it on your server.
- Website content: View top content from your site and see the words that other sites use to link to it.
Seeing how your site performs
A second step is learning what drives traffic to your site.- Top queries: Find the top queries that drive traffic to your site and where your site is included in the top search results. This will let you learn how users are finding your site.
- Indexing information: See how your site is indexed and which of your pages are included in the index. If we find violations in your site, we’ll give you the opportunity to fix the problems and request reinclusion of your site.
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