Macbook no longer automatically connects to wireless

Hi There - I have a macbook (That I love). Just in the past few weeks since the last OS update I've had problems with my airport. Usually when you open your computer from sleep it automatically connects back to your wireless network. Mine no longer does. i have checked all my wireless settings and my WEP password is still there. If I click on airport and select my network I connect, but it doesn't do it automatically. I have seen a number of other people with the same problem....is anyone else having this issue? How do you solve it?
Here's some other references I found:
http://forums.macosxhints.com/showthread.php?t=61850
http://macosx.com/forums/mac-os-x-system-mac-software/281192-mac-will-not-automa ticcaly-connect-wireless-network.html
possible solution: http://discussions.apple.com/thread.jspa?messageID=3240817&#3240817
Macbook   Mac OS X (10.4.8)  

I am having the same issue here. I have followed the suggested fixes, to no avail. Here's a run down of my symptoms, attempted fixes, and the "fix."
when coming out of sleep, my wireless connection no longer works. i can connect to a neighbors, but when i attempt to switch back to mine, nada. airport status shows it is connected with full reception. no internet. no network connect. i got nada.
rebooted the router. nada. rebooted the cable modem. nada. rebooted modem, then the router. nada. (d-link DI-624. also had the Linksys WRTXXX)
attempted this fix: http://docs.info.apple.com/article.html?artnum=304482 nada
in order to establish a connection, i go through the following:
- when the macbook comes out of sleep, i open safari and get the network diagnostic screen prompt.
- i turn off airport, shut down safari, then turn airport back on.
- reopen safari and get the network diagnostic prompt.
- go get a cup of coffee, nature break, etc.
- come back and my internet start up page is USUALLY waiting on me.
the problem with this, is that the connection is usually DROPPED five to ten minutes into the connection and everything above is REPEATED.
my solution? as much as i hate to say it, use the PC. it doesn't have this problem. Apple needs to address this issue with a firmware upgrade NOW.
MacBook 2GHz Core Duo Mac OS X (10.4.8)
MacBook 2 GHz Core Duo Mac OS X (10.4.8)
MacBook 2 GHz Core Duo Mac OS X (10.4.8)

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