LG VX-8300

I just bought the 8300 earlier this week, and am experiencing a very loud echo of my own voice when talking to someone. Of course, this is normal on all phones to some extent, but mine is pronounced. I think the technical term for this is foldback or feedback idk. But does anyone else with this phone have the same problem? I am still within my 15 day period so i can return it but i want to make sure not all of the phones are like this.