Wifi connection issues after iOS 5 upgrade in iphone 4

Hello All,

After the upgrade everything seems to have been allright but for some reason, iphone 4 iOS5 has completely failed to recognize my home network. I use Airport Extreme and Express which uses dual bands. No matter how much I try to restart the router and phone the problem seems to persist.Wifi tries to recognize the network and accepts the password but it gets stuck in identifying the network forever and does not actually connect to it. It does not find the router and assigns itself some wierd ip address. However it does the outside networks like starbucks and apple store. Its just home network thats causing this issue.

I would greatly appreciate any help and ideas regarding this issue. Its really annoying and I have never had problem like this in the past. I have attached an image of stuck wifi window here. Let me know if you have any clue regarding this issue with ios 5 and wifi.

Thanks

Sam