My tablet was working fine for about 1 year, then, it started to just SHUT OFF even when it was fully charged. Next, when I tried to charge it about a week later, the screen was black, then it turned white for about 1 second, then shut off. Now, the screen wont even turn white for a second. The USB is clear and undamaged as far as I can see, so, could it be a bad battery? Is there a way I can fix it?