It might not be Handtec specific problem as I'm getting occasional reboots and lockups as well, bought the N9 from the official retailer here. The lockups seem to be related to window manager, as they have always happened on a swipe; and the vkb appears to be working if open (there is haptic feedback but the screen is not updated). Edit: On a second though, the lockups remind me the notorious nVidia "freeze bug", thus a driver issue.