My iPhone 5c is inconsistant with its charging. The Lightning port seems to be stopping it from charging reliably and the slightest knock throws it off. My battery seems to drain quicker now. Should that happen?

As Stated, the slightest movement of phone/ cable makes the phone stop charging, If positioned right, it will charge up to 100% as usual, but I have noticed that its battery performance has been poor since I have had this...
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