It happened suddenly and my last firmware update is a few months ago ( 4.8.11073 from 08/05/2018 . I avoid firmware updates as much as possible from previous poor experiences from Kobo and as a former IT professional in general I apply the general rule "if it is not completely broken, don't try to fix it" .
I am convinced this is a default of the kobo, not my sight, since if I keep refresh rate to 3 , one every 3 pages is correctly displayed. I also had noticed like frostschutz that refresh was slower when reading outside in summer.
I also have noticed ghosting effects since the beginning but here this is every char in the page which is blurred.
Maybe I am paying more attention to details now .
Thank for your answers.
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