WiFI N issue on iphone 4

hello
Lost of persons have constated a Wifi connection issue with iDevice on WiFi N mode. This problem involve connection lost or data connection lost event if the iphone already have an ip adress. I've tried in my wifi router different channels, 40 mhz bandiwth mode, 20 bandwith mhz mode. Iphone wifi connection work sometimes but it's a weak connection (good signal, ip adress still connected but no data transit between). So i have to switch the iphone to air mode and back to normal to retrieve a wifi connection working for 10min.
I can't send music via airplay to my airport express too. Air port detected, but send no music on it. Disable WiFi N mode to G mode work perfectly with airplay on AE. Wifi data working a well without any issues. The problem seems last iphone/ipad ios, because lots of poeples have these problem in many different brand wifi router. Some guys said there was no problem on previous iOs version (4.3?).
Hope this bug will be fixed in iOS5 to improve WiFi 802.11 N mode.
Cheer
Thierry

HHi I had the same issue my husband went back to using his iPhone 4, I have the iPhone 5 and a iPad and mini. I couldn't set the wifi on his iPhon,
This is what I did and what my be the issue everyone is having. The iPhone 4 works with a 2.4 ghz radio frequency all the new products work with a 5 ghz. If you change the frequency in your router the IPhone 4 will pick up your wifi. the only problem is that once you change it all your other pproducts will not pick up the wifi connection. I'm going to continue to change the frequency until they all work, will keep you up dated.

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