Currently Being ModeratedApr 6, 2013 8:16 PM (in response to Jimmychimpo)
It sort of sounds like a battery problem, like it is not holding a charge. However, if it sometimes has no problem and runs for an extended period as expected after disconnecting, then it's probably not a battey problem. A bad battery is not going to be "picky" like that...
Can you be more specific when you say "It doesn't work"? How does it not work? Is the screen still ON when the problem occurs, or does the screen go OFF?