JS_Harris - 6:22 am on Jul 25, 2013 (gmt 0)
I'm not convinced that you are sent directly to page two when this happens, I believe you are sent below the sites that have been hand picked and grandfathered in which *may* be anywhere from 2-3 sites to 10+ depending on niche popularity.
I continually see this in one niche where my newer pages bounce from top spot within 2-4 days of reaching it to then linger in positions 4-6 regardless of effort. I do make a concerted effort to get new pages a lot of attention which is how they rank so well with little history but the drop is expected without fail.
If it helps, my site is informational and I do not attempt to compete with product buy search terms. In my case the 'big brand' sites are well known including wikipedia and two wall st listed companies that produce medium-low quality guides. I can handle automatically being behind wikipedia to a certain degree but the other two... not so much.