Iphone keeps charging and un charging?

Okay so it's an old Iphone 4, my cousin gave me it but for a while when I plug it into my docking station in a while it will say it's not charging then I go to charge it and it will do the same thing. How do I fix it?

My iPhone used to do this as well, it is most likely not sitting in the docking station properly, therefore, it is half in, half out. (Charging, Uncharging).
-The It Girl

Don't use the docking station.

instead get a lightning cable, the white charger and plug it into a wall power outlet. It's the best way to charge + apple recommends it.

i try to use a wall outlet. Charging through a PC is not efficient. PC USB slots don't provide enough power to efficiently charge the iphone.

so use a wall power outlet. And obviously if you can't charge it through the wall outlet buy a new charger or cable.

or get the USB port on your iphone repaired.

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