Help HTC Legend looses Wi-Fi

[Leg]

Hello, I have bought a HTC Legend, And i am downloading some new apps and stuff. And the thing is, I am connected to my home Wi-Fi. And sometimes, I cant connect to websites. And it works again if i restart my Wi-Fi. But the weird part is, It still shows that i am connected to my Wi-Fi network. How can i fix this problem?

Regards, Legendary