Ken, thanks again for your advice!
During the weekend, I read very much, and the surprising is that there have been very little incidents of the reported kind. When it happened, then it was with the uSD card inserted, but reading the kepub stored on the device ítself. Now I terminated this book and even started a book that's sored on the card - until now without issue. Strange, strange.
However, at the moment I see no necessity to change something; I also desisted, preliminarily, from trying a reset. Perhaps the device needs indeed a recovery from the uSD card for some days, from time to time.
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