I've had my Samsung Galaxy Note 10.1 for 6 months now and those same issues started last week for me. First the battery wouldn't last as long as it used to. Then it would take longer to charge. Then when I was using my tablet while charging, it started losing the charge. Then it would indicate that it was charging, but the charge was not increasing. I had to turn it off to get it to charge. I managed to charge it to fill again and it managed to hold the charge all day with very little use. I just connected the charger and got the x over the battery. I simply unplugged and replugged the charger and now the charge is increasing even while in use, be it slowly. Is this some kind of glitch that is going pass or is something wrong with the battery/charger? What can I do about it?