Why does my airport express keep dissconnecting from the wifi it's extending?

Ok, so I have a airport express (latest gen) that is extending wifi from a time capsule. The problem is that at least once a day the airport disconnects from the wifi it's extending and I have to unplug it and plug it back in like 5 times before it starts working again. The error messages I keep getting from airport utility when it disconnects is "no dns server", "internet connection" and " wireless network" all with yellow circles next to them. Please help if you can. It would be greatly appreciated. Thank you.
Also, when it disconnects the light on the front flashes amber (yellow).

It's almost a miracle that it was working at all.
Each wall will absorb on average, about 15-20% of the signal so after 4 walls...and a ceiling....which is typically 2-3 time thicker than a wall....there isn't going to much signal left to extend.
Try locating the Express no more than half the distance between the Time Capsule and the general area upstairs that needs more wireless coverage. Minimize obstructions in the signal path as much as possible.
If that does not help, we'll have to do some SNR measurements to see if what you are trying to do is even feasible.

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Thank you for visiting Apple Support Communities.
Here is an article that I would recommend going through when experiencing Wi-Fi connectivity issues. Also, make sure all firmware updates have been processed on the router and the settings have been adjusted to the recommended settings in the second article below.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
iOS and OS X: Recommended settings for Wi-Fi routers and access points
http://support.apple.com/kb/HT4199
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Why does my airport express keep dissconnecting from the wifi it's extending?

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