Here and there. I think it software, not hardware. The most recent time, I got half the password entered, there was some sort of popup, nothing of significance, and then nothing. Couldn't even do the swipe down to turn off having held power button. Another time I recall it happening, something to do with the ease of access controls got turned on, and all of a sudden touch was disabled to the point that I couldn't type, but was still enabled to the point that the device turned on its audio and started telling me what buttons I was pressing etc. I'm not too fussed, my machine is slowly falling apart, so just living with it until such a time that I am forced to return it for a faulty hardware claim. Sure I could send it back right now, but I love it too much. I'll just wait till I have no choice in the matter. Kickstand will probably only last a month or so more by the look of things.