Why does my iPhone keep discontinuing it's charging?

I was talking to my friend on kik (on my iPhone 5 if that's needed to be clarified,)while my phone was charging, and it started making that charging sound (the sound when you plug the charger into the phone and I know that is normal) continuously. I thought I was pulling the plug but no, I was not. I checked the wires, and everything else and it was fine. I treat my phone the same way I usually do ever since day 1 with it, and it's just irritating now. Anybody having the same thing happening to them? Help!

(And be aware, I'm not being a douche or anything but if you have something off-topic or non-related to this, please don't post it, cause this is serious to me and the off-topic stuff you say ain't gonna help my issue here.)

Hi
If you have got another charger or you can ask your friend who has its own iphone 5 to give you the charger just to check if the problem is in your charger or not. You can even use another electricity switch board to see if there might be any problem with the switch board.
1- Try another iphone charger.
2- Try another switch board for charging your phone.
3-Check the charging settings. Download any app that can check your mobile battery health.
4- If the problem presists I think you should go to the dealer and ask him/her to check your phone or replace it.

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