I'm not terribly surprised. Power optimizations for GSM and other cell radios are well known, Google and others work very closely with the network provider to try to get things optimized correctly so a device can last awhile on the network. With WiFi, you are kinda left to your own devices trying to optimize the battery use.
And of course, B&Ns software could also keep the WiFi radio active, preventing it from going to sleep correctly.
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