Airports with clients off ethernet dropped off quite often

I have multiple situations that have the same similarities and the same problem:
Airports and/or Expresses joining and or extending a network, and which have clients connected to their ethernet ports, have those clients quite often dropped off the network and internet access for those clients as well is lost. In a few words the IP addresses from the main router are gone.
Basically, while it works great for a day or two, the Airport joining the network either goes flashing orange or the clients off its ethernet port do, if they are other Airports, and they disappear from the network. A power reset of the joining Airport or the clients or both restores functionality. This happens only on networks that are extended, not older ones who are WDS networks, and it may be related to that, the newer hardware, and/or firmware levels, etc.
I have only seen this happen with the new(three antennas) Extremes and Time Capsules. Personally, I never had a problem until I replaced my older Time Capsule with one of the new ones and then drop offs started, first of the new Time Capsule acting in that capacity, and then when I moved it off to a different location and it no longer had clients hanging off its ethernet ports, and replaced it with an Airport Express which took over the clients visa the same switch I have been using for a couple of years. Now, the Airport Express goes flashing yellow. The Time Capsule hasn't had a problem in the same time. So, the problem is with Airports joining a network and distributing IPs given to them from the main router. They just can't do it for too long.
This has caused me great strain with a couple of clients and recently in my own setup. I initially thought it was interference, but in my own place I know what is and isn't happening. It's not that.
Anyone else seen this with the new hardware either in a new setup or inserted in a fine functioning network?
Message was edited by: Zebra1

Even with 4 GB my iMac 7,1 wasn't a speed demon in Lion, upgrading to 6 GB made a world of difference, but I still run out of RAM... wish it could take 16 GB or more.
Open Activity Monitor in Applications>Utilities, select All Processes & sort on CPU%, any indications there?
How much RAM & free space do you have also, click on the Memory & Disk Usage Tabs.
In the Memory tab, are there a lot of Pageouts?

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Extend an existing Wi-Fi network’s range.
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Selamat Phil Smith,
Actually do we know each other, cause i know a phil smith.
Actually an ether net cable is OK for the short term. But if i get another computer it may get complex. Spent a lot removing cables too.... Looks like i will have to buy the special modem router... Painful $600.
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Cheers and thanks for the idea
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Airports with clients off ethernet dropped off quite often

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