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Wireless connection drops then password rejected on 12.04

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http://askubuntu.com – I'm using an Acer Aspire 7520, with a AR242x / AR542x Wireless Network Adapter with a clean install of 12.04 from disk. On bootup my wireless connection works automatically, for a while. Then after about 10/20 minutes of use, the connection drops, and when it attempts to reconnect it repeatedly asks me for the wireless password. As the password is pre-entered I click Connect, and wait a minute or so while it attempts to connect, then it asks again, as if the router hasn't accepted the password this time. If I reboot, it connects no problem...for while then the process repeats. I tried adding (HowTos)