It is pretty hard, this was the same thing that happened to mine, i think it can not be fixed any more , just get a new one, and never think of playing while it is charging,and make sure to charge it completely full, because if you charged it 50% you will have to get to get charge more and play less, but better charge it 100% full, and charge less with more playing , and be sure to never tie it just keep it straight.