I have to hold the tablet with two hands to lock it. The lock key requires a sustained right sliding pressure which I'm not always going to be willing to do. If i am replying in a text entry field as i am doing now and i walk away setting the N810 down and then come back and pick it up the odds of me accidentally touching a link on the edge of the screen are pretty high (say 50%) which sends me somewhere else and erases everything i just spent time typing in, similar to what just happened 10 minutes ago; I used the dpad moving left within the text entry field and the whole tablet crashed. This is the second time i've written this reply. I'm just saying maybe there is a user adjustable setting that says, "don't accept single touch link launches until submit button has been touched."