Whenever my oasis 3rd gen or my husband's 2nd gen starts randomly rebooting, I just remove the last several ebooks placed on the devices, whether from amazon, kindle unlimited or send to kindle. Haven't sideload ebooks in forever. That usually fixes the rebooting.
If it was important to me I'd reload a book at a time and see which one(s) is the problem. Amazon seems to have no epub error checking regardless of the ebook source.
Just my experience.
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