I do have normal fluctuations in traffic during the week, as which I think is normal. I also know these traffic levels can change week by week. In Google Analytics I have an profile for each section of my website. Before these things happened I saw fluctuations per section due to algorithmic changes, some went up some went down, but now I see fluctuations at all sections mostly at the same time. (sometimes one section doesn’t lose its traffic straight away like all the others but really soon after that)
Or the traffic on all sections it going up again until I reach the “magic number” again and then I will lose my traffic almost instantly and it will repeat itself again.
To me the “magical number ” of visitors is more of a trigger then the time frame wherein it happens. I do have active and slow periods during this yoyo effect. So sometimes it may take 6 weeks sometimes only 4. This also depends on other traffic sources. But it will always happen when I reach that particular traffic level that I will start to lose (Google) traffic. And at the end of the month I almost have exactly the same number of visitors as the previous one.
Over the last couple of months I’ve gained a lot of new (external) traffic from Bing, Facebook and Twitter, also the activity on my website increased but I never got more visitors in total and if I seemed to get over this “magical number” I got less traffic from Google. The numbers I’m reporting are for all traffic not just Google, but Google is seems like acting like some sort of regulator for my overall traffic levels.
I also use Awatstats and when I check the statistics for 2010 I almost have exactly the same number of visitors a month (max 2000 apart from the average) . When I check previous years this never happened. It was always was low in the summertime lots of traffic during the end and of the year (which makes sense to me). 2010 has been way to steady.
My site has got mainly unique content + a forum and I do not aim (or track) any specific keyword. I’ve always been doing well just on long tail (and I still do, except from this problem).