I had a similar drop over a 2 month period last December. I believe it's Google. They are the biggest fish in the pond and when they move, us smaller fish can get pushed head over heals by one flick of their tail! They won't acknowledge it and it's very frustrating. I wish there was more competition, but we have what we have and have to deal with it.

I would highly recommend the site maps. When I submitted my site maps (I have over 5 million pages online), my traffic has risen steadily since the first month they were online and continue to this day. Since I monitor Googlebot very closely (and every other bot out there), I can see how appetizing my database is at any given moment. Today, Google queried over 86000 pages from my site, once each second. The sitemap was the key.

If you find any other information during this slow period, let us know. But for the grace of G_, it could happen to any of us.

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