Is there a known conflict between an extreme g base station and express n in a roaming network?

I have an extreme g base station connected to a cable modem, an express g connected to a linksys switch via ethernet, and an express n connected to the same switch via Ethernet. The switch is connected to the extreme g base station by Ethernet as well. They are all set up to be a roaming network with 128 bit WEP security. I made two changes to the network recently. I went from a WDS setup with the extreme g and express g, which was generally stable but slow, to the roaming setup above, and I added the express n. Now something is causing the network to loose connectivity at least once a day, requiring a restart of the extreme g. My hunch is the express n is causing problems for the older g units.
Does anyone know if this is a known problem and if there is a solution?
Thanks.

For what its worth.....
I have mixed older "b/g" and newer "n" devices in "extended" and "roaming" networks for years, and have never experienced any issues with this type of setup.
As a Community Support "regular", I can say that I cannot recall having seen the type of issue that you have described, but other users may comment with different opinions.

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Is there a known conflict between an extreme g base station and express n in a roaming network?

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