My iPhone flash isn't working?

One day it worked, and the next it doesn't. What happens is, I'll turn the flash on to use it as a flashlight and it stays on for about 4 seconds then automatically turns off. Then, if I'm taking a picture, it goes off, then turns off right before the photo shutter goes off, so the picture comes out black. With a video, it goes for about 4 seconds again then shuts off. It's really frustrating. What's going on?

Fgnfng

Faulty flash light… It's hardware… Have it replaced if its under warranty

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