today i was doing a bench test and for some strange reason all dimes(old silver and new clad) keep coming up as a penny, everything else registered where it was sopposed to, nickles,quarters,halves. the only thing that would make the machine sound off as a dime was a half cent. this GTI 1500 is only a month old and am wondering if i should send it back to have recalibrated or just live with all my dime hits coming up as a penny. the sizing image is right on for all coins. has anyone else had any type of problem like this?