My sister owns an iPod Touch. Three weeks ago, we upgraded the device to version 4 because most of the Apps were not functioning under version 3 anymore. After the upgrade, something happened with the WiFi. After not using the iPod Touch for about five to ten minutes, when she would go back to check something online, the device would pop up an error message of "Not connected to the internet." The WiFi is still working, but it refuses to connect. This happens both after sleep mode and during regular use. In addition, when WiFi access is regained, the signal's strength is reduced to literally one bar (approx. the speed of a modem), even when it's near the router. Our router is a NETGEAR WNR834Bv2. My sister has two iPod Touches, both on version 4. It's only one of the Touches that has is having the problem. Looks like we got ourselves a bug.