Sometimes Minecraft PE completely crashes the hardware requiring removing the battery to reboot the device. All that happens is that the game freezes and the entire system becomes unresponsive. I mean everything. I cannot turn the power off via button. I cannot do anything on the device. This can happen when we are doing anything. You could just be roaming a field and then BAM crash. It makes me not even want to play it because I have no idea what to do when it happens on hers because it has no removable battery.