Wireless connection stops and starts using Mountain Lion

Since installing ML a few days ago, my wireless connection isn't stable for about the first five minutes after waking from sleep mode ... the process is:
- wake from sleep mode
- wait about 10 seconds for icon to reflect wireless signal
- click on a website to open
- wireless signal starts searching and finds nothing
- click on network diagnostics
- signal returns
- try to open website again
- same problem occurs
This seems to last a few minutes but once the connection finally takes, I'm able to access the website and others ...
This is occurring with a brand new (mid 2012) MacBook Pro 13"

Yup, same here. I see this in multiple locations, so its not the router.

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