Hi if anyone can help it would be great thanks in advance :D

*i have done flushdns and other console commands involving renewing.

*I have this problem on all my expansions Wrath , cata and MoP

*I have power cycled my router.

*I have deleted the cache and /Data Cache.

*if i ping the server i can reach it.

*My internet browser and everything works fine, speed tests shows my internet is normal.

*everything Worked fine until last night this problem suddenly struck.