AirPort does not auto-connect to existing network after waking from sleep

...but I can easily connect it manually. I read the FAQ on this subject and followed the resetting steps in system preferences/network (the procedure was specific for Intel iMacs-but I did it anyway)
It did not help. The flaw just occurred a couple of days ago, after a year of flawless operation Please help.

Solved! I trashed the internet connect preference in the library, and it worked!

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    ~~~~~~~~~~~~~~~
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