I'd exchange it. I had some issues with the hardware of my RT, and MS was very good about replacing it -- they want users to be happy, they want us to have as close to perfect an experience as possible. I think if you didn't exchange it it would probably bother your like a thorn in your side for the rest of your life.
Maybe a little exaggeration but you know what I mean.
I just replaced my Asus Taichi because it has a loose trackpad. I am 10,000 times happier with a perfect piece of hardware. That is the way it should be.