Trouble with wifi on Linksys WRT54GS

Hello,

First of all, I have a Linksys Wireless-G Broadband Router with SpeedBooster ""WRT54GS"". I have connected to the router with my laptop. good signal quality, but the problem now is that after a while of surfing the internet, my connection to the internet freezes. It either takes some time for it to load or i have to constantly press of refresh. It some time goes to the page with ""This webpage is not available"". When this happens, my signal isn't lost from my router but more like my internet doesn't work for some reason.

I don't know if its my router's problem or my laptop. But other laptop and desktop at home seems to work fine but mine.