I've those kind of problems as well sometimes :) That makes me think about something in physics but I'm not sure to remember it correctly. Take your smartphone for example (preferentially over a bed). If you rotate it around the axis through the center of mass (basically it's the center of the screen) and parallel to the longest edge of handset, it will rotate stable. Do the same with the axis of rotation parallel to the shortest edge, same thing, rotation stable. But if you