I have a V2 (by serial #) Libra2.
It now locks up about once a week

, usually while transitioning (New chapter, back to main My Books) .
Known (by me) other ways to ABEND (this also applied to my other Kobo):
changing the structure (split, join or removal of files in the EPUB) without using KU to make the TOC (on the reader) synced.