it's possessed... take it to your nearest carrier exorcist... jk... mine shows the battery symbol when plugged in, but if i unplug the charger (to take with me) the phone turns on automatically...
When I turn mine off to charge, I wait at least 10 or 15 seconds before plugging in. If I am too fast with it, sometimes, but not always, it starts back up. Mind of its own I guess.