Leopard knocks my airport base off the the net

How about this. My network which is a cable modem to an Airport extreme BS(UFO) to a 24 port switch with several wired and wireless computers and a airport express to speakers, all works perfectly, has for years.
I plug in the ether net cable into my new 24" iMac with leopard for internet access and some time within the next few hours I lose internet access over the entire network, wired and wireless.
If a unplug the power to the Airport base station, wait 30 seconds, plug it back in, I have internet access again, for a while.
I have since unplugged the iMac with leopard and... no problems. I waited a couple of days and tried plugging the ether net cable into the iMac again... after a while I lost access again.
Unplug the iMac with leopard and no airport problems since.
What do I do?

You are one of many people having the same problem.
See another thread here:
http://discussions.apple.com/message.jspa?messageID=6015427

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