I have this SD card problem also. After I turn several pages of a book, it will close automatically and Kobo goes to home page. In the Books screen, changing page can also lead to home page. In each case, all books in SD card disappear from the home page or the Books screen. I did a factory reset and upgraded it back to 1.9.11, but the problem is still there. It seems that under the firmware 1.9.11, the SD card sometimes loses power supply.
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