Lion mountain newest update :I loos the internet connection, but the network shows connected. And IPhone, IPad stay connected and work. Only the MacBook Pro , which worked perfectly before with Lion unless I updated to Mountain. I have tried everything.

I have a MacBook Pro, Early 2011, 2 GHz Intel Core i7 which I udated some days ago with Lion Mountain 10.8.2. Before it worked just perfect. Now, since the update,  I loos the internet connection after a wile, (at the beginning every 20 sec, now up to 4 hours) even that the sign of the WiFi network connection shows to be perfectly connected.
My other divices like IPhone, IPad stay connected and work. The rooter is new and cannot be the problem. I tried nearly everything I found on the bloggs, but nothing helped actually. It must be a softwear problem on Lion Mountain, what can I do?
Thanks for any help

I FINALLY SOLVED THIS ISSUE!!!!
New routers have "mixed" modes for your network; this means that it will automatically choose the best option between wireless-B, wireless-G and wireless-N network modes. I used to experience this issue using the 2.4 GHz. mixed mode wireless network.
Thankfully, my router can create 2 networks: a 2.4 GHz. network and a 5 GHz. network.
When I randomly changed this value to "use only wireless-B and wireless-G" trying to fix an issue with a wi-fi expander, the iMac wi-fi  issue dissapeared! I tried it with wireless-N only, but it didn't work.
So, finally, I have a 2.4 GHz network with only wireless-B and wireless-G modes which works PERFECT with the iMac, and a 5 GHz. network with a mixed* wireless mode for everything else mode.
*PD: by "mixed" mode it means that the router will automatically choose between B, G and N network modes as it fits better.

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