iPhone 5: 6.1.2 breaks 5 GHz Wi-Fi connectivity

Hi all,

after applying the iOS 6.1.2 update my iPhone 5 does no longer connect to my 5 GHz 802.11n wireless network at home. No problems with 2,4 GHz. My iPad 4 and iPad mini, also with 6.1.2, have no 5 GHz connectivity problems.

My router is an AVM Fritz!Box 7390 running 5 and 2,4 GHz Wi-Fi simultaneously.

Anybody else?

Best,

Thomas