Why does my iPhone 5c die at different percentages?

Why does my iPhone 5c die at different percentages? - 1

I've had my phone for over a year now and for about a week it's been dying at different percentages and I don't know what to do. It sometimes dies at 40% or 70%, this morning it made it to 8% and then died and I just don't know what's wrong with it. When I got onto snapchat as well it seems die. I've factory restored my phone as well and it didn't seem to fix the problem.

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