Screen shakes terribly when running down stairs/hill

[Finchley]

I have this problem when I am running down hills/stairs too. Like when running into Cass Hollow it bounces around a lot, I use an ATI card don't know if that makes a difference or if it is a problem that everyone has.

I have an Nvidia GTS 240 1 ghz, so doesnt seem to be a problem with a specific graphics card.