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That means the database on the device is corrupt in some way. The device will frequently seem OK, but, if the device writes to the database, it probably won't get saved. You will notice problems after a power off as the database is read from the file.
The database on the device is an SQLite database. If you have the tools you can check it and try to fix it. But, the usual fix is to log out on the device. This removes the current database and creates a new one.
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