I haven't used much Kobo Vox after the update, but it seemed to be working pretty well - no death in sleep.
Has anyone tried to install "Juice Defender" app? I forgot where I saw people suggesting it as a fix to WiFi/battery related problems - may be on this forum. This app can be tuned to only turn WiFi on for specific applications; presumably it also prevents it from starting while in a sleep mode. Anyway, I installed it yesterday, and I think it works as expected, no issues so far.
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