Fading signal on A2H ASUS notebook

Has anyone else experienced problems with the built-in wireless cards on the
A2500H ASUS notebook, or any ASUS notebooks with built-in wireless card.
It mentions it on the ASUS website but the fix doesn't make any difference.
The signal strength remains constant but every 10 secs under winXP control
or 30sec under the Intel Pro software the traffic dies and then 2 secs later
it returns.
I've sent an email to ASUS but haven't got any reply.

I have plugged in a D-Link 650+ card and it works perfect. So do 4 other
notebooks on the system.

Peter