Airport Extreme-have wifi connection but no internet on some devices???

I just replaced my linksys router with the latest (tower) Airport Extreme and an Airport Express as an extention of the network.  Now I had a heak of a tme setting this up to mimic what the linksys did so I would have a smooth transition.  I have a windows server 2008 R2 server which is my file server, DHCP & DNS server.  I set my Extreme with the "DHCP & NAT" set the range I use which is 10.0.0.10 - .253, Set the router's address to 10.0.0.10 in network properties as well as setting the default host to point back to my server at 10.0.0.100.  I also checked "Enable NAT port mapping protocol".  Everthing seems to be working great most of the time...my wired PC's have internet and their proper IP addresses, my iMac and MacBook Pro have internet and proper IP addresses, iPad, iPhones...BUT I am noticing on my iPhone 5 that I'll show a full wifi signal but no IP address there for no internet.  Now this happened a couple times and the only way I got it back was to do a rest of the phone.  I have never had any wifi issues with this prior to installing the Extreme and Express.  So I thought it was just the iPhone but my iPad just behaved the same way and a rest took care of it.  Worse at the same time I checked my MacBook and I have the exlimation point over the wifi in the top tool bar.  I can see and pick my SSID but couldn't get an IP address until I clicked the Airport Utility then it connected.
So basically I am looking for any suggestions or better yet fixes on my issues.  I'm not sure if I have the Airport Extreme configured properly for it to work with the Windows 2008 Server.
I appreciate any help at all!
Thank you greatly in advance,
Dave

And when is apple going to put a NAT only mode on the Extreme????
Apple have a policy of not telling.. you can ask .. but they don't tell.
I am a rather recent arrival on the Mac/Apple seen so I would also wonder how an OSX server is setup with AE..
For wireless in particular, you can use Enterprise level security.. and that might fix it... because instead of using a preset key, as standard in wireless you can use a username and password combo from a radius server.. which might then be used to pass IP via dhcp. Something to consider if you don't mind getting a bit more complex..
Look at this thread which is looking at using ox x server which is basically the same issue you are having.
https://discussions.apple.com/thread/2756247?start=0&tstart=0
The idea of using a static range of IP addresses.. that might work.. with DHCP actually turned off.. I have used this setup for something completely different.. ie to pass different DNS to clients that need access to Netflix from overseas.. I did not explore it from a your no dhcp setup.. but that is another option to try.. there is so little info supplied it is hard to know and you just have to trial and error with it.
Here is another interesting post
http://www.youtube.com/watch?v=qyU4vpMljEI
Clearly other people are hitting the issue.

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