Takamine EF508KC w/Softcase

I received the guitar as promised. Great service. I opened the carefully rapped guitar. What a pleasure to look at. It played like a dream for the first time. Three days after after 30 minutes of playing soft finger picking a buzzing sound started on the D string. Then it got louder and louder. Now I can only hear the buzzing nothing else on the open D string. I think there is something seriously wrong inside the guitar. I don't believe it was made to takamine standards. I think maybe a new starting luthier was learning on the job. In Japan you stick to doing the same thing over and over again. I imagine this luthier is producing this guitar for the rest of his short lived life at takamine. I asked for a return. I am buying the P7NC takamine. Once I get rid of this beautiful dream which has turned into a horrible nightmare.