Why won't my iPhone connect to the charger?

I have an iPhone 4 and it has suddenly not been connecting to it USB charger? I have tried it with three different ones and all of them work for a second and you have to move it about just to get it to connect for a second! Why is this happening? What can I do to fix it?

Okey you don't worry, you can change your charger then its working in previously
if any problem then you contact me?

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