I too have experienced the "device decides to spontaneously turn itself on and drain the batteries" syndrome in this and previous firmware releases. Given that the battery must be charged inside the 770 and the lack of any 3rd party external battery charger for the 770, I have had to leave my 770 at home several times to recharge due to a discharged battery. The poor controllability and random behavior of power management in the 770 is perhaps my biggest single sticking point with the device.