Hello, I have a Samsung Galaxy Ace and for the past week the battery has drained extremely quickly - often within minutes of it being unplugged from the charger if I'm making a phone call or using wireless. When I plug it back it, the phone indicates that the battery is fully or nearly charged, but the same thing keeps happening. If I attempt to turn the phone on without plugging it in after it's died, it goes a bit haywire (flashing screens). Is this a phone problem, or a battery problem? I'd really like to avoid getting a new phone so soon - I've had this one for less than two years.