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Sticking something in the back is not a factory reset, it's a soft reset. Try a factory reset- go to settings, advanced, and follow the options to reset it back to original out-of-the-box settings. In my experience, it fixes the vast majority of unexplained misbehaviours.
You'll have to reload your books and such, but provided you've got everything backed up and all it shouldn't take too long and will probably be less trouble than driving out to a store and having a difficult conversation about an exchange.
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