Sometimes google traffic will drop down for a couple of days even thought your listings haven't changed from what you can see. I think sometimes it has to do with updates occurring at different times with the various google world versions. You might want to look more closely to see if you are gaining or losing traffic from foreign google sources.
I also think that when they are doing general data center updates, your traffic can go up and down like a $5 whore at a military base.
Alex
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