Please help! iMac randomly disconnects from internet. Wi-fi via BT hub. I am baffled by all of the suggestions when I google this problem! Any simple solution? Thanks!

Please Help! My brand new imac randomly disconnects from the internet. We have a BT hub - wi-fi. I have googled this issue and see that it is relatively common and it is incredibly frustrating. sadly, I have been unable to wade through the suggestions others have had as to how to solve the problem as i have no technical knowledge and am basically baffled by the list of suggestions. Please can anyone explain why this happens and what to do? It is fairly simple to reconnect each time but it is driving me mad having to. It generally happens when the computer is asleep but sometimes in the middle of doing something. Thanks!!!!!!

What frequency, security are you running? It would have been helpful if you specified in the first post.
Did you create a new Location in System Preferences->Network pane, Location pull-down. Create a new custom named Location. Then after you create that new Location click on the 'Apply' button to save that new custom named Location. See if that helps.
Lastly a lot of people have reported that WEP in lion is problmatic and it would be better to use WPA2 if you can.

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