Extend Wi-Fi w/ Airport Express breaks existing network

I am attempting to wirelessly extend/repeat a Wi-Fi network that originates in a 4th generation Time Capsule with a 1st generation N version Airport Express.

I am going through the settings, i choose to extend an existing network, pick the network in the drop-box enter the proper password.
after applying the changes, it breaks the existing network and all connections are lost.
if you unplug the airport express then the network works again.

Any ideas? this makes no sense.

Both units are running the most recent firmware, i have factory reset both and set up from scratch again but the issue persists.
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jspazianoctoAsked:
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Carlisle_AgentCommented:
Have you tried pinging the IP address of the Airport when it is not working? Might be a change in the WPA2 settings when attempting to connect. In that case, reset by: Settings>General>Reset>Reset Network Settings.
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jspazianoctoAuthor Commented:
thanks.

i was able to resolve this.
it just seemed to fix itself without changing any settings, very strange.

all i did was connect with a wired connection, make sure i could ping it. disconnected ethernet and made sure i could continue to ping it.

now it's working fine.
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jspazianoctoAuthor Commented:
issue resolved itself
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