Hi all, I recently bought an Asus TF300T.Apparently, when you do not switch it off all together when charging but leave it in sleep mode, it does "ding" every few seconds. Every few "dings" it also wakes up, the screen lights up and goes back to sleep when I don't enter the security pattern only to start "dinging" again and so forth and so on. (the ding is the one used for screen lock/unlock). The manual doesn't mention anything about this behaviour that I find quite annoying. Is this normal? tx in advance, Peter.