Last night I was charging it and while it was on the charger the battery kept going down. I assumed it was from using it while it was charging. I turn off the screen. I turn it back to to check a notification and then it completely shuts down. I keep trying to charge it. It shows no sign that its charging. BUT if I keep pressing the power button and holding it, it shows the battery bar for about 2 seconds and then shuts right back off.