Wifi wont reconnect

so have noticed sense upgraded mbp 10.7 when close lid on , try re-open it not connect wireless network again. work around have found go in , disable wifi , re-enable it. not sure deal there. having similar issues or have idea how might fix it.

 

my mba well. pretty obnoxious. every time sleeps, , woken, loses connection. don't have turn antenna on/off, have go click on network again.

router using?

 

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