As sometimes happens, a new version of firmware can, in addition to getting rid of old bugs, added new ones. Also happened with firmware iOS 4.3.3-she was cleaning the bug whereby owners collect and do not delete information on the location of users. However, as it became known found users in the new firmware is much more serious bug that affects it directly on your devices running iOS 4.3.3 I have problems connecting to WiFi networks.
On the Apple support forums, there are also numerous complaints that ajDevajsy after firmware to 4.3.3 became disconnected from the network periodically, this is especially true for iPhone 3GS/4. On the iPad this problem isn’t visible thanks to a powerful WiFi module.
Those who encountered this problem do not worry if Apple will confirm it officially, it will soon be another update that fixes this bug. However, to avoid problems with connecting to WiFi networks, I recommend not updated iOS 4.3.3.