Yes, unzipping it shows a 1.6 megabyte single html chapter. That will cause hangs and crashes in almost all early epub readers. Many of those freak out with any chapter over about 200K to 300K in size.
And as DiapDealer said, this azw3 was most likely created from an old mobi not an actual epub.
I would strongly recommend either manually splitting the huge single file into manageable chapters in Sigil or do an epub to epub conversion in Calibre to do the same.
KevinH
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