HT2497 iMac OS Lion 10.7.4, If I leave my computer for 10 plus minutes on returning the WiFi has disconnected and will only reconnect if I restart!

Any help will be appreciated, on how I can prevent my iMac from losing the internet!

See these for steps to resolve:
http://hints.macworld.com/article.php?story=20110918051930924
http://osxdaily.com/2011/08/01/turn-off-resume-per-app-in-mac-os-x-lion/

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