The new iPad has unstable 3G connection
3G icon is visible and signal is strong but safari tells no connection (other programs don't have connection as well). Switching to airplane mode and back doesnt help and reset (off and on) always helps, but problem appears again after some period. I can't tell exactly how much time should I wait but I noted that it appears after long idle period.
iPad 2 Wi-Fi + 3G, iOS 5.1