My guess would be the former too. I know some other devices have that issue. If I am away from home, then I usually turn off wireless except for when I actually plan to use it. I get long battery life that way. I typically use touch page turns rather than the buttons. And, I also do lots of highlighting and looking up words in the dictionary. When I am at home, then I have 3G off and Wi-fi on (with standby).
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