Macbook ethernet problem

A few days ago my ethernet socket started misbehaving. After plugging in the cable, if I pushed the plug gently to the right of the socket it worked fine, but release the pressure and it stopped working. Looking at the Network preferences, it's clear - push to the right and a green light appears against Ethernet, release and the green light goes grey. Now it's stopped working completely.
So it seems like a hardware problem, or at least some physical problem with the socket. But I don't understand what could have caused it. It's been working fine for 4 months, I haven't dropped it and there's no physical damage. The socket looks fine, the pins are straight, the 4 metal bits in the socket are in place (2 at the top, 2 at the sides) and the cable locks in place OK. I've tried different cables and connecting to different sockets as well. The only thing I've been doing is plugging and unplugging the cable every day.
Any suggestions, or do I have to take it to an Apple Store for repair?
Thanks

I would suggest taking it in for repair. Hopefully you're still under warranty. The constant plugging and unplugging could have caused something to happen to the socket.

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