my tablet is not holding a charge for very long. Ex: used tablet for 10 minutes, came back a few hours later to use it and battery was empty. Tried to restart it. It wouldn't go past the opening screen. When the battery is empty, it will take a full 24 hours to charge fully. I keep it on the charger all the time. I never take it off, so I don't understand why it isn't holding a charge. I am so frustrated with it that I am ready to just send it back. Please someone help me !!!!!