Patch 878 on my board is exhibiting some odd behavior - the sub bass is dropping out every three notes.
In my case it's one voice that does this. I've been aware of it for a while: it's down to using sync and the sub oscillator at the same time. If you initialise a patch, set VCO 1 frequency to E3 and turn on sync, turn the levels of VCO 1 and 2 to zero and Sub Octave to max then you'll probably find three of your voices play an octave lower than the others. In my case, four play an octave lower, one sometimes jumps around between notes an octave apart, and one plays at the same pitch as VCO 2.
I've found a couple of other oddities in some of my own patches in certain circumstances: maximum resonance on one voice may sound slightly different until the synth is fully warmed up, and large amounts of x-mod can cause cause one voice to go slightly out of tune with the others.
I'm guessing it's component tolerances. I haven't decided whether I'm actually bothered by it yet because 99% of the time it's not an issue. And, well, this is an analog synth so things aren't going to be absolutely perfect.