MBP 13in drops wifi when computer goes to sleep, I have to restart the computer to reconnect. Help?

I recently did the Lion update on my MBP. Since then my computer will drop wifi connection everytime the computer goes to sleep. It will not let me log on network saying invailed password. I have to restart the computer and then it connects automatically. This is NOT a router problem. Skip any and all advice about routers. I have 4 other Apple products all connected to wifi perfectly. This is a MBP issue. Please help.

On the MBP, go to /Library/Preferences/System Configuration
Move all the files in the System Configuration folder to the Trash.
Restart the Mac.
It will not let me log on network saying invailed password
Just in case, open Keychain Access located in /Applications/Utilities
Select Passwords on the left.
Use the search field top right corner of the window to locate your network keychain.
Now right or control click the keychain then click Get Info then select the Attributes tab.
Click: Show password
Make sure it's correct.
And launch AirPort Utility /Applications/Utilities
Select the connection on the left the click Manual Setup.
Select AirPort from the menu then select the Wireless tab.
Make sure the password is available there then click Update.

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MBP 13in drops wifi when computer goes to sleep, I have to restart the computer to reconnect. Help?

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