I appreciate any advice here....I have been playing with my Dunlop 200g XL's for right around a year (playing only once or twice a week). Just a few days ago one of them out of no where started to make a pinging sound on off center hits. If I hold the handle really tight and far down the sound disappears. It doesn't appear to affect playability, but it's getting to me. Is there something wrong with my racket? Is there anything I can do to make the sound disappear? I already have a rubberband dampener, and like I said, the sound is brand new. Thanks for the help!!!