I tested about 7 sleeps today (where I forced the sleep and where I let it sleep itself). It did not wake when I pushed the power button ONE time out of the 7 times (so needed to do a hard reset - 10s power button push; click; press power again and then it came back on).
There was ONE thing unique about that time: I let it sleep itself - and I was reading a book in my Kobo library prior to that. All other times I let it sleep itself, I was reading a book in Overdrive or a mag in zinio....
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