unexpected shutdown when taking video
when i take videos with my iphone 4S, the phone unexpectedlly shuts down, even if there's a good charge remaining. It shows battery low, when I try to switch it on again. when I connect it to the charger, the phone turns on and shows the level of charge it was at when it had shut down.
for example, if the charge was 50% when it shut down while taking a video, it would indicate to connect to the charger, when I try and switch on , and then, it would come back to 50% as soon as I connect the charger again.
I have the latest verison of ios 7 on the phone.
iPhone 4S, iOS 5.1.1