I have a sprint GNex. I just started having this problem recently (but before the 4.3 update). I plug my phone in overnight and at some point in the middle of the night an error occurs that make the phone think it is off the charger and has a fully depleted battery. The battery level icon shows no charge and if I pull the phone off the charger it immediately says it has to shut down due to a low battery. However, as soon as I turn it back on it is back to normal with a full charge. Has anyone else had this problem? This is starting to happen every night.