Hi Mate. I currently don't have my notes from the SES with me, but trying to recall what Matt Cutts said... I think as part of the process to moving over to the new BigDaddy not all of the data centres will reflect the new architecture and they may be testing stuff on the other data centres. As far as I know Big Daddy is on 5 of them.
Have you checked your cached date on the pages that have dropped? Also have you looked at if there is a difference in the frequency that your sites are getting crawled? Is there a way for you to chart the two main ranges of Gbot crawls over say the last 6 weeks? If not just group the different types of Gbot as see if there is a trend.
I had a problem with a site I spammed the hell out of G a couple of years ago. I made a shed load of cash from it. It hadn't been crawled for a year. I cleaned up the site and did a reinclusion. Now its got a future PR6 and is getting crawled nicely.
Also do you have any 301 redirects or use .htaccess in anyway? Have you modified robots.txt, changed hosts, got a load of links recently?
At the moment there is a neat little whole in the algo that can be exploited regarding domain names, if you've done any changes recently to yours this could have been picked up in the radar.
Also, are these sites included in the betting, adult, gambling arenas? As there could be associated issues?
__________________
My blog is here - sometimes its worth a read. /// Is always looking for merchants to promote on my Christmas gift Ideas blog! PM me with suggestions.
|