Discussion about the Korg PolySix synthesizer

I'm not sure if it's just the sounds I have loaded inside the polysix (because it didn't 
do it with the factory presets) but when the keyboard is on, every so often the low C 
will sound.  But it does it automatically, and sometimes it sticks.  I have to push the 
key to release it from sounding.  Does this sound like something is stuck on the key 
contact?  I really don't feel like opening up the synth (agrrgh) but if I have to I guess 
i will.  Anyway, let me know if this happens to anyone.