Some Websites Not loading Proper or Show Server Not not Found.

I face a unique problem from many days. Some websites show Server Not Found or Images not load proper. I have to refresh 2-3 times. Specially i am facing this kind of problem in and and many sites like this show server not found and then i have to refresh 2-3 times then work proper. what can be the issue? Anybody can tell me?? I really need it urgent

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