Discussion about the Korg PolySix synthesizer

Hi all I just recieved my polysix aware that it had a problem it seems
that every 6th note i play no mater where it is on there board it cuts
out, But only in poly mode. The key does not sound when i have the
switch set to eg on the VCA but when switched to wave on the vca the
sixth note whatever it may be is muffled. Does anyone have any
ideas!?! Bearing in mind that the batt has never been changed i
wodered if this may have something to do with it though all buttons
lights etc work as they should!??!......will be changing batt this week!