Probably a bad time to post because of all the iPhone 5 hype, but I've noticed my iPhone 4S always disconnects from my home WiFi network. Ill be using it, then every 20 minutes or so it will fall back on cellular, then reconnect a minute later. If I go to settings to see whats up, my home network doesnt even show up even though all my other devices are connected just fine. It is a persistent problem that is gradually getting worse, over the past few months. I don't have this issue with an other device in my home, anyone else experience something like this?