Why are my chargers acting like this?

Why are my chargers acting like this?

Hello, I have an iPhone 5, and it is only 3 months old. I don't know if the charger port got water in it or what, but I noticed 2 weeks ago my charger wasn't doing its job. It worked for a couple months, but then it wouldn't charge it at all unless I had it in a certain position (cord wrapped around iPhone or pulled tightly to the right side).So I got a new charger. Same thing happened with that one, so I got the one I'm using now. NOW it's doing the same thing! I'm so angry! It will be connected, and then it will lose connection. I can't ask my dad or anyone to get me another new charger, because they won't replace it again. What should I do? Should I tape it?

Its probably not the charger, but the phone thats jacked up, i had an iphone, and the same thing happened, but luckily i had like 5 other phones in a drawer so now i have that one.

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