site can’t be reached–>redirect to the page

Hi to all,
for all my wp site, if im trying to access to some pages from any web browser, the first look show a quick classic error page that said “the site can’t be reached” and then the page is redirect and correctly served… why??
how i can investigate over it?
it seems like a cache problem and because im using this plugin i post this question here…
ps the error page shows disappear so quick so i cant access on it a viewing which is the problem that raised this