My iPhone 5 screen is acting weird?

When I plug in my iPhone 5 to charge it starts acting weird. When I'm texting or typing it won't hit the key and won't scroll down or up right, it also freezes but when I in plug it it's all better. I don't have the charger it came with because I got the phone online and it was used. It might have been something the previous owner did but I don't know.

Sounds like a hardware problem, maybe the senser or battery? You could go to an Apple store, they can help you with this kind of thing.

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