Quote:
Originally Posted by vice-versa
First question : Yes : no problem to get back where I left my reading, even if I let the device go to sleep by itself
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The problem won't happen with sleep. It will be after a power off. While running, the firmware works of a an in memory copy of the database. If it is corrupt, the writes to it don't work properly. When you power off and on, the database is reread but it will be an old version of the data. The information for the tiles is stored in the database, and it sounds like that table is corrupt. Storing the reading position is also a common problem with a corrupt database.
You can also check the database with a SQLite browser. Or, if you use calibre, my Kobo Utilities plugin has a check option.