I'm not sure how a [google] ad could cause a page reload.
Google ads are displayed in an iframe, by which time the page headers
I'm not saying its impossible as I suppose if there was really bad code it could take you off site by using some sort of XSS /injection exploiting existing
Google ads have strict policies
about auto-refresh and even site owners are not allowed to display google ads on any page that would auto-refresh from code they themselves have inserted.
I'm also seeing the ASOS ad today and Ive just had a look at the code and cant see anything untoward.