Default [Q] YouTube Problem

Hello,
About one week ago, the YouTube application in my phone stopped to work on my wi-fi (I got "There was problem in the network" And "retry" button). Whats weird in this story is the fact that it happen only in the wi fi in my house, but not in 3G or in other wi-fi networks. I tried it in another phone and it had the same problem.

What can I do?

Thanks