Try Enabling WMM
Apple is actually having me do troubleshooting for them. They have no idea what the problem is. They now wanted me to enable WMM on my router and that didn't work. This is the last thing I will do. This problem has been ongoing for over 3 months now with no solution, and they are still introducting new products. lol.No wonder the stock price is close to $500!
iPhone 5, iOS 6.0.1