Diagnosing the cause of a buzzing instrument can be very challenging. Before attempting any repair or modification on your instrument, please have an experienced repair technician examine it first. He or she will be able to fix it surprisingly fast or direct you to someone who can. If at all possible, you should bring it to the store where your uke was originally purchased. If your instrument is still under warranty, they can arrange to have your instrument sent to Kala for repairs.