Thank you for your response so fast!
Indeed, I remember putting my PC on standby without ejecting the e-reader ... Did this cause the problem?
As I did not know what is to restore a recent backup of the database, i
signed out of the Kobo account on the device.
And it's ok !
Some things are different (not the same version of the software) but all my books are in the e-reader (disorder).
Thank you veryyyyy much for you help (and I will now always carefully eject my e-reader !!!)
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