another cause could be swiping too near to the bottom edge.
i realise that a lot of times, when i accidentally tap the bottom, it brings up the page scroll menu which lets you use a slider to move along pages at a faster rate.
perhaps accidentally swiping here could (1) activate the scroll menu and (2) scrolling the pages, in one go. the result is you get an unintended multipage scrolling non-stop?
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