iPhone turning off while doing something.
i have an iphone 3gs. The problem is, that- it is turning off even it has 50% charge. Its happening when im doing something on it, like playing a game. I have replaced a battery two times. Nothing has changed. Do you maybe have any ideas what can it be? Maybe I need to replace something else, and it is not the battery fault?
Sorry for my english, it's not my first language.
Is this a good question?