The jeweler my fiance and I got my ring from suggested putting sizing beads in mine. When I first got it it did the same thing as yours and it drove me nuts aesthetically, although as someone else said, I loved that it made me feel skinny-fingered. *LOL* Once the sizing beads were in it stopped doing it as much. The beads also allow room for finger expansion/bloating due to warm weather, salty foods, and that certain time of the month.
I'd suggest you look into getting that done if the fit is otherwise okay for you.
http://www.professionaljeweler.com/archives/articles/1998/nov98/1198fys1.html
http://www.google.com/imgres?imgurl...a=X&ei=WNIPTITtB4WJnQf437mWDQ&ved=0CDcQ9QEwBQ
The jeweler said they can sometimes be uncomfortable but I've been wearing my ring since February and so far it's been just fine. I've only noticed some discomfort once, when I was carrying heavy grocery store bags into the house and the heavy handles were pressed against the ring just right.