There are departures for the stability, if one prepares the tablet, but because you need to unhook the bottom corners and the tablet in the "Vertiefugen" make the cover, unfortunately, the tablet is not considered sufficient by the 2 remaining corners so that it with smaller movements slide down - me personally not so important since I where you do not have loose from the frame no movies on your tablet watch but there are better solutions the tablet.
That is why a star deduction.