I suspect "after a while" means: 1. Turn on the device 2. After the splash screen, the book itself appears (if set to boot straight into book in the settings), but the device is unresponsive otherwise 3. As the device becomes responsive after bootup, the book display shifts a bit.
I use the inbuilt reader only for some PDF files, not epubs. For me the bootup effect is that, after the initial display of the PDF page, Pocketbook reconsiders and shows a slightly different section of the page. I remember the same behaviour from Pocketbook Inkpad 2, so I would not say it is a new bug/feature introduced with the latest update.
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