No Wifi Networks after Sleep

I'm running Mavrics for a while and all has been good. But lately after long sleep on my Macbook Pro (17" early 11) no wifi networks are available on the interface list. When I restart, they re-appear (most of the time).
I've tried creating a new network location, turned wifi on and off, even deleated the preferences in the library, but no luck.
I'm an engineer and this has got me stumped.
Thanks in advance!

To see if you computer even needs this fix, I would suggest you click on Software Update...
It will show up in Software Update if your computer fits the specs for the update.
The Software Update version is only 1.3 MB
The other download directly from Apple is 25.81 MB
big difference even if a person has 3 to 5 computers the Software Update will take less time.

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