So I've got a 710ce with the expression system. It's been great until recently when I have noticed a popping sound coming through the PA. The pop occurs usually after i have played it for a song or two, and then is noticeable whenever I touch the string to the fret. I have tried playing softly as well as my normal strum and the click still comes through to the point of unsuitability. Has anyone had similar problems? solutions?? Btw. I have tried quick fixes (battery, etc.) as well as run some tests to figure out if there were any DC current issues.