After four months of it working, my wife's iPad2 suddenly will mot connect to our wireless network. It does not give the option to enter a password, it merely says unable to connect to the network. My iPad2 has not had this problem. We also have three iPhones and a MacBook Pro and they all connect fine. I backed it up and restored it to factory settings. It now is up to date but still gives the same message. Can someone please help?