My iPhone charger only sometimes works?

My iPhone charger works fine, like I don't have to hold it in certain positions. But sometimes when I take it off the charger and put it back on, it just doesn't work. It'll start working again if I put a new jack on it or put it in a different outlet. Why does it do this?

It might be something with the wiring, I would recommend buying a new one as soon as possible

Similar problem… Try to get a new cable, also sometimes charging from the pc helps

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