Discussion about the Korg PolySix synthesizer

Hi all,

I'm the proud new owner of a Polysix. I love it! Can't take my hands 
off those knobs - the filters are just great! But I'm having a 
problem with it and I'm hoping someone can tell me what it's about 
and maybe even what can be done...

After I've played the synth for a while, notes start to go out of 
pitch every now and then. It happens randomly every 10-30 sec or so. 
The notes go off pitch with a note or so and always jump or slide 
back to the original pitch again within half a second.

At first I thought it was some filter setting of mine that caused 
it, but as it turns out I get this no matter how the Poly6 is 
programmed (or if I use a preset or a fresh "manual" sound). (By the 
way, it takes about 20 minutes for the unit to get in perfect tune 
after a cold start. Don't know if that's normal or if it's related 
to this problem in any way).

I'd be truly grateful for any help!

Peter