My charging port?

[AC Question]

I got a replacement for my last Galaxy s2 5 or 4 months ago. Everything has been smooth until now. My phone still charges, but if i were to move my phone a little or using my phone at all it would stop charging and I would have to jerk it a bit for it to start working again. Its not my charger because I have tried everyone elses charger in the house and it does the same thing. But my original charger works fine with everyone elses. Help?