Originally Posted by rkomar
I don't know about the 613, but the default on the Pro models is to lock the screen and freeze out the buttons if you tap the power button. You see a little key symbol in the top right corner to indicate when that happens. Maybe something like that is happening to you, rather than an actual bug.
Yes, I'm aware of that. When you tap the power button, a lock apears in the middle of the screen. However this problem happens whithout pressing that button and no lock apears. Everything seems fine except that not a single button works except for the power one.