I have been noticing the following problem with my iPhone 5, as well as iPad 3, running iOS 6.1.2. When connecting via Wifi to an Airport Extreme A1408 (firmware 7.6.3), if the security is set to "WPA2 personal", it will eventually stop working after a while. The symptoms are that the Wifi signal is still shown (the "bars" are there), but no traffic flows at all. To make it work again, I have to switch Wifi off then back on on the iPhone/iPad. I have done some extensive tests on this. I have found out that: - Wifi stops working when the devices want to negotiate a lower speed (for example when going a bit further away from the Airport Extreme) - it happens on both 2.4 and 5 GHz - it happens with wide channels enabled or disabled - the multicast rate is irrelevant - it happens on all Wifi channels, when setting them manually Also, this is not a single device issue, because: - I have tried 2 different iPhone 5 as well as an iPad 3 - I have tried 2 different Airport Extremes Now comes the interesting part: if I change the security to "WPA/WPA2 personal" (as opposed to WPA2 only), everything works perfectly again. This is 100% reproduceable. Does anyone else have this very same problem? I wonder if this is an Airport problem or an iOS 6.1.2 problem. On a different Wifi router (not an Airport), WPA2 only works fine.