Both my wife and I have a Forma and hers does the exact same thing. We are pretty sure in her case it's the smart cover as when we take it out of the cover it doesn't lock up after charging (Official Kobo cover). I have no idea why the cover would cause that except if it has something to do with the magnet.
Mine doesn't have that issue but I do have frequent lockup's on some of my books. Usually opening them in Calibre and running the epub check fixes those.
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