- My kobo 'refreshes' the screen at the start of every chapter.

- I typically stop reading at the end of chapters

- The so-called screen saver creates dark and light points wherever there are dark and light points on the book's cover

- The screen needs to be refreshed to return these points to homogeneity

Outcome: most of the times the screen is refreshed, I get no use of it. Most of the time I spend reading, the screen needs to be refreshed.