Can not stay connected to Airport express

Question

I have an airport exress that is less then 9 months old.  I have my internet provide wirlessely so my macbook pro picks up the signal and i share it with the airport exress.  With the AE set to bridge mode.  This was all working fine for the last 3 months, but now for some reason I can not stay connected with any of my devices wirelessly with the AE.  I try to connect with my Iphone 4s and when i click on the network to connect i never recieve a check mark on the left all it does is give me the moving circle.  I try to search the web on the phone and it will work for a second then not work for who know how long then work for a second ect.... i have hard rebooted the AE, reset network settings in my phone, reset smc and pram.  when i access the ae through airport utility on my mac the internet shows green and the AE show amber becuase it says it does not have a valid ip address.  I access the AE from my phone and the AE shows the same and the internet will go from green to amber and back.  Also it will not stay connected to the AE i try to change setting on the AE through my phone and as long as i do it quickly it works fine, but if i wait anylonger then 10-30 seconds the phone drops the AE and i have to start over even though it will pick it up again with in  a second or two.  this is the same for ipad, three iphones, dell computer, and a android phone. 

Answer 1

Simply reconfigure your Airport Express to either use for airtunes only or to extend the range of the existing network. This effectively connects the Airport Express to your main wireless router as a basic access node rather than a separate router creating its own network.
If you consult the User Guide that came with your Airport Express you'll find additional information on how to setup an Express to simply extend a local wireless network rather than function independently.
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