I'm having an issue with both my iPhone and iPad - both on iOS 6.1.2 (actually not sure if it's that on iPad, latest iOS regardless).
I connect to my WPA2 enabled Wifi network at home (tried WPA also) and it requests the password. I enter the password and can browse as normal connected to the Wifi network. If the phone or iPad sleeps however, I have no Wifi connectivity upon waking. I need to go into settings, select the Wifi network again and once more reenter a password for it. Essentially it seems as though the network settings have no persistence.
- I have tried resetting "all settings" back to default.
- I have tried resetting "network settings".
- I had no issue previous to upgrading to iOS6.
- I have tried changing encryption methods on the router.
Modem is a Netgear DGN2000.
I'm not sure anyone will be able to offer many suggestions, as really since the iPhone and iPad is so restrictive in what you can do with it, by nature it's hard to trouble shoot effectively.