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When I updated, my battery was depleting really rapidly. It seemed odd, and when I checked, my bluetooth had been switched on by default (I *never* use bluetooth for anything). I turned it off and all was good. Interestingly only a couple of other people said their bluetooth had switched on. On a second upgrade (after I had gone down to 4.1) this very same thing didn't happen. Irt was a random occurrence. weird, or what.
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