Airport takes forever to find my router only after lid has been closed

My macbook only started having this problem about a month ago. Whenever I close the laptop and it goes to sleep, then open it, it takes a few minutes for it to go from "Searching" to "Scanning" to actually choosing my network, and even then it doesn't always go to my preferred network automatically. It didn't used to do this and it seems to only happen when I close the laptop. When I leave the computer to go to sleep on its own without closing it, then hit a button to wake it again, the wifi network is still connected.
This problem is really only annoying because of the time it takes to find my network. But I'm also curious because it never used to do this and I'm not sure why it's doing it only on my computer. My girlfriend's older iBook G4 finds a network in about 1 second.
does anyone know why this might be happening and what I could do to fix it?
Thanks.

Try this:
1) Go to /Library/Preferences/SystemConfiguration and delete com.apple.airport.preferences.plist. You will need admin privileges to do this.
2) Start System Preferences/Network > Airport
- Click on Advanced, and AirPort tab
- Remove ALL the names in the Preferred Networks list (even the one for the network you use)
- Click on OK
- Now add the network you usually use by clicking on + and (re) entering its details (including password).
- Click on OK and exit System Preferences
Good luck
Bob

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