I have a theory, I always charge overnight, leaving wireless on, and pressing the off button putting it in to sleep mode. I also have the option to turn off wireless when in sleep turned on.
So my theory is thus:
mobile data off
wireless on
phone in sleep
ABOVE mean that no apps are connected as wireless is off during sleep?
So when i wake up, turn on my phone, unplug it, wireless comes on, ALL my apps grab a connection and do a nights worth of updates, draining the battery like mad.
Something to think about anyway, i never put it into sleep at night anymore.
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