Lose connection to router after iMac wakes up

Ok, when my iMac is waking up after it has been asleep it loses its connection to the router (grayed out). I can turn it off, turn it on, select my network but it says it cannot establish a connection to base station. Then for some reason it starts to work. The only thing I have done is installed iSight updater.
Any ideas?
Thx

Well, I prefer to use WEP at the behest of a neighbor who is a computer forensics specialist with the FBI. While WEP isn't all that great, it is better than nothing. I filter by MAC, use 128bit, and turn off the SSID.
Back to the issue at hand. I believe it is a problem with the the computers connection to the card. By connection I do not mean the physical connetion but the packets are not leaving the computer. Using the network utility and doing a traceroute to google.com, I can see the connection timeout to my router, even though it is connected and has great signal strength.
This issue started right after I did an iSight update. Also, this isue seems to be picking up some steam as the number of discussion on this topic is increasing.

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Hello ghesser,
Thank you for the details of the issue you are experiencing with Wi-Fi on your MacBook Pro after setting up your Time Capsule. I would be concerned about this too.
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Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
Thank you for posting in the Apple Support Community.
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