I bought 2 new frames yesterday (tour diablo mids) and strung them last night. I took them to the courts today and while hitting with the one I noticed a slight rattle (coming from the top of the frame, I think). The rattle obviously does not hinder the way the racquet plays, but it really annoys me. The other one hits great. I'm not sure if anyone has experienced this and found a way to fix it. Does anyone has any suggestions for me or even any ideas on what I can check? Should I restring it? Take it back? Thanks for your responses.