Set your phone to cellular, clear ie internet cache and you should see that you don't have the problem while using cellular data. The problem is probably within your own router. Your router has been hacked or is not properly configured. In any event, you should reset your router to factory...
Don't feel left out because, 3 months ago, I purchased 3, 1 for myself, my wife and my oldest grand son, and none of them has an issue. I might have been lucky, but I just thought that they were great phones.
The one I seen on Ebay was cheaper than on the Microsoft store, but after adding chipping + import charges, it was no that far off from the Microsoft price. With Microsoft, you get free shipping. Anyway!
I know this is a 6 months old thread, but, This phone is now available for only $119CA on the Canadian Microsoft Store. At $249 it was an expensive proposition, but at $119 it's a no brainer for someone who wants to try windows mobile.