I've had my S3 for maybe 2 months now, and today it's been having problems charging. It seems like it will only charge when the cord is in a certain position. I've had problems with cords like this before, so I'm wondering, should I replace the charger? I've plugged it into an electrical outlet and my computer and I've had the same problem.
Main causes for phone battery charging problems are
* Excessive charging
* Removing battery without switching off the phone
* Tossing the phones
*Dropping the phones on the floor
Replace the battery with new genuine samsung battery and try to avoid above mentioned as much as you can.