I finally bit the bullet and wiped everything off, did a factory reset, and updated from there to the latest software. I also found a plugin for calibre that converts epubs to kepub format, and I'm using that for most books now.
I get occasional non-responsive Issues now but not as often, and more importantly, the really irritating "kobo completely freezes up during startup if it's not plugged in to a charger" issue is finally gone.
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