Mountain Lion upgrade and Internet connection problems ?

Since I upgraded my Macbook Air, it does not want to connect to my home Internet network anymore. My Ipad, Iphone and tablet PC are all working fine, but to connect to the network I need to restart and even reset my router to be able to connect. Needless to say, I lose connection when it gets into sleep mode and when it is shut down. Anyone having the same problem or a solution ?

I'm having similar problems with a 2012 13" MacBook Air. It's brand new, came installed with Mountain Lion.
I get disconnected from the wireless randomly and the wireless icons turns gray. Like you, I have an iPad, multiple computers and they all work fine.
Instead of restarting the router, I go into Safari and do a network diagnostics and it picks up the connection easily enough.
No solution as of yet, but I posted a topic here if you want to follow it:
http://forums.macrumors.com/showthread.php?p=15435867

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