How much have you shot it? Your string may have stretched, making the cam(s) go out of tune(yes, even a single cam bow will be out of tune). If the cam or cams are out of tune, they tend to make a bow louder. I would be willing to bet this is what happened. Take it to a dealer and have them put a couple twists in your string and/or cables if it needs it.

Then again, Rack could be right...

peashooter