This is caused by the hidden magnet that is meant to put iPad in sleep mode when closed. This magnet may also trigger the sleep / wake mode from behind the iPad. To avoid this, please fold and insert the leather band in between the cover to create a space so that the magnet cannot trigger the sleep mode. Your Typi will hold like this:
The space in between prevents the magnet from triggering sleep mode.
You may also fold the case cover a bit over the symmetry to avoid the contact of magnet and iPad like shown: