Why does my iPhone 5c keep on shutting off?

So I've had my iPhone 5c for a while now and it's been acting up lately. I haven't used it for a while because it just keeps on randomly turning off and I don't know why. Do you guys have any suggestions?

Added (1). By the way I've already changed the battery on my phone and my charger is fine just have like two. I'm starting think it's my screen because i once tried to turn it on and than it started to glitch /

Either bad charger or bad phone battery

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