Constant reresh on mobile site

Hi,

When using the mobile site on my iPhone (iOS 5) sometimes the site keeps refreshing. So when i am typing i keep loosing my text and when i am reading it keeps bringing me to the top of the page. Most of the time its fine but sometimes it does happen.

Something i noticed was the last 2 times it happened there was a Telstra advert on the bottom of the page.

Thanks

How long a time period passes before the refresh triggers?

about 10 - 20 seconds i think

This what the Telstra ad links to - Switch to us ... on us - Telstra