Connector Problem

I just got a replacement iPod 3 days ago and i notice that it is a lot harder to connect or disconnect my dock connector to my iPod touch 4th Generation. When I take my iPod off, I have to acually put strength into it. Also when I try to take it out my just remove my case and not the dock connector. I have an Apple appointment but I don't know if it is worth it. Should I go? Also the case does not bother or block the charger. What should I do?