K I have a used GH3 guitar for World Tour. It was working fine since I got it on December 25, 2008. Maybe, I'd say about 2 days ago, it started acting up. occasionally, after I strum, (usually on a sustained note) the guitar acts like i strummed twice ruining my score multiply-er even though I clearly didn't strum twice. It might have gotton messed up because I played B.Y.O.B. on expert bass a lot until I beat it. Has this happened to you before? How can I fix it?