Problems with Safari - server not found - for no reason!

Just in the last week when I go to a webpage (and it can be any random page and its intermittent) it will come up blank saying "Safari cannot open the page because the server cannot be found" HOWEVER there is nothing wrong with my internet connection or with the website I am trying to navigate to.

Example, I wanted to go to mailcall couriers. I click on the link on my favourites bar, I get the above error message. I got to google and try access it, same thing. I go to google and click on a sub page link (like contact us) and it is fine and I can then navigate to their working home page from there.

Safari seems to do this routinely with some pages but not all, and not always the same ones. Sometimes the pages will open sometimes I will get this error - but if I try opening that same page at teh same time on my ipad its fine! So it is not the website or the internet.

I have tried resetting safari, clearing cache etc... to no avail.

NOW, on a similar note, I have numerous open pages in safari on my iphone 5S - as of today - all thos pages are coming up witht eh same above error message and wont open

Safari 7.0.1

Any help is much appreciated as this is driving me insane.