Apple TV breaks my Airport Express wifi network

Hi,
I have an Apple TV, Airport Express (mode = "Participate in a WDS network") and Airport Exreme (mode = "create network") and iMac all connected to router/hub via Enternet. Whenever I used my Apple TV, my iPhone and iPad can no longer connect to the wifi network (they keep asking for the password, but 'are unable to connect' even when the password is re-entered). Powering the Airport Express off and on fixes the problem (until next time the Apple TV is used). Any ideas on how to fix this?
Thanks
Luke

Participate in a WDS network would not be the correct setting for the AirPort Express because this type of setting is only used when the AirPort Express is connecting using wireless. You are connecting using Ethernet.
Suggest that you change the AirPort Express to "create a wireless network" using the same wireless network name, security setting and password as the AirPort Extreme....and be sure to configure it in Bridge Mode as the final step before you Update the settings for the device.
This will provide one large "roaming" network.

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http://support.apple.com/kb/HT4199
http://www.ehow.com/how_6831952_test-airport-card.html
http://www.youtube.com/watch?v=aXiZn64aZfg
http://www.cnet.com/news/how-to-invoke-and-interpret-the-apple-hardware-tests/
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