Quick advice, your kobo is running
Device firmware version: (4, 31, 19086)
It would be best if you downgrade your firmware to 4.30.
4.31 is a carcrash of a firmware release. See the firmware page for 4.31
https://www.mobileread.com/forums/sh...d.php?t=344604 (about 15 pages in it gets real depressing.)