My iPhone 5 dies on it's own?

I sometimes go to sleep with my phone on 100% and wake up to it dead, this happens all the time it just dies on it's own I've even put it on airplane and nothing what could be wrong with it?

It could have a battery problem. Or maybe it just runs out of charge overnight. Just keep it on charger

Sounds like battery is out, mine is the same in the morning as when I went to bed, or maybe 1% lower. I never put it on airplane mode.

Do a factory reset and see if it fixes it. You could have a rogue application running.

Can you be more specific please?

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