I have a problem with internet connection. It connects fine( netcfg or wicd ) but after some time( varies from few seconds to several minutes ) it stops working( it doesn't ping anything, even other hosts on LAN network ) but it still says "Associated" in iwconfig and shows IP adress in ifconfig, in other words it still says that it's connected.
I'm connecting to a WPA secured wi-fi network.

Can it be a problem with drivers?

BTW: Great guide