Why does my wireless LAN stop mid session

I start up in the morning and everything is fine, but at some point during the day, my wireless LAN quits.  I've changed modems and routers but I still have the problem.  My provider sees nothing on his end and other computers on my home network work fine.  When I turn the wireless off and back on I get a new lease on wireless until it decides to do it again.  I'm running the latest OS X 10.8.2 (3.1 GHz Intel Core i5) with 4GB 1333 Mhz DDR3.  Has anyone had this problem and if so have you found the solution.  Thanks!

From the menu bar, select
 ▹ System Preferences... ▹ Network
Click the Assist me button and select Assistant. Follow the prompts. How far do you get?

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