Yes, I'm using only epubs on my Kobo readers.
And yes, I neglected to say that both devices have the exact same book on them, and the title has been run through calibre.
This is for all my side-loaded books that I tested.
Both devices are fully charged to 100% (I did this yesterday; and, in fact I like to keep my readers charged as a matter of choice.)
I haven't powered off the Aura HD to test your idea, but I'll do that now. (But then, again, I haven't powered off the Glo, either - the one that does not have this issue.)
I don't rely upon additional storage: I no longer like to load up my readers and usually only put about 20-60 ebooks on my devices.
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