This AirPort base station was unable to extend the wireless network.

I have an AirPort Extreme in the lounge connected to BT infinity.
I also have an airport express in the kitchen connected to a stereo system.
I have had this set up for around 12 months.
The airport express will not extend the wireless network.
I reset it, restart, factory reset etc and it will work fine for around 3 days, then I get the same error message saying
This AirPort base station was unable to extend the wireless network. Make sure the wireless network you’re trying to extend was set up and is working correctly, that you entered a matching wireless network password into this device, and that this device is in range of the wireless network.
The express is situated easily within range of the extreme. And the airplay between those two, my iMac and two apple tv's works pretty much as it should.
Can someone please shed some light on this?
Maybe I have it in a wrong setting or summut....

G Beach wrote:
I am also experiencing a recent failure in my Airport devices no longer extending my wireless network. 
My Aiport Express and second Airport Extreme were extending my wireless network for more than a year
The only change that has taken place lately is that the firmware for both devices was upgraded to 7.6.4, however the upgrade was only in response to trying to resolve this problem.  Needless to say, the firmware upgrade did not resolve anything.
If I didn't know better, I'd have thought I wrote the above. 
I have a TC from a few years ago (last one before the tower, I think), plus the older AEBS that it replaced extending the network, plus a 1-year-old Express also extending. I had upgraded them all to 7.6.3/4 when it came out, but reverted them all to 7.6.1 when everything went crapways (others having the same issues of the LAN regularly croaking), and didn't bother upgrading again since. 
Today I just tried 7.6.4 on all of them, and it seemed OK at first with green lights all around in Airport Utility.  Then I made one change, which was to enable 5Ghz on the main AEBS/TC only (the express doesn't need it, and the older AEBS can't do it).
The latter two started flasing amber and giving the "unable to extend wireless network" error message.
So I'm wondering if you are similarly using 5Ghz?

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    Correct?
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    http://support.apple.com/kb/HT4259?viewlocale=en_US&locale=en_US
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