wireless unstable

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http://askubuntu.com – I have a Asus eee PC 1001PX running ubuntu 12.04. Everything works well but the wifi is unstable. When I boot the wifi works fine, but after about 5-10 min it gets slow, disconnects etc and the computer starts to run slowly. The it is ok after reboot, for about 5-10 min. Any ideas? I have tried everything I have found with google but nothing works. I have tried a few different wifi routers and it is always the same. sudo lshw -class network *-network description: Wireless interface product: AR9285 Wireless Network Adapter (PCI-Express) vendor: Atheros (HowTos)