potentialgeek - 11:45 am on Dec 8, 2007 (gmt 0)

I'm thinking its on a line and when they test/tweak a filter one of the above factors trips the site?

I'm not convinced it's a trust issue. The kind of time line you give for this cycle implies there's automated or scheduled filter tweaking. I sincerely doubt there's such rigid weekly planning to Google's tweaking.

Have you checked your competition? Do their sites bounce, too? I've never heard of this bouncing before. Most of the talk is about penalties, which get you stuck w/ no movement.

Any other guesses on your SERP Bouncing?

p/g