Ubuntu 10.10 Wifi router TP-Link TD-W8901G
After connecting to wifi network, net do not work (tested with ping 18.104.22.168). After some time (usually seconds) ping go through. Then after some time go still. After some extra time works again. And this "up and down" repeats constantly.
Netbook (Asus n71) is placed 10cm from Wifi, on Win7 there is no such problem. And it showed up only recently (~2 months ago).
How to repair it? How to diagnose it?