32-voice mode is a little buggy for me. With Modern Grand in U1, not sure what I did, but playing Moonlight Sonata with lots of sustain, I managed to get it to a point where pressing keys did nothing some of the time. If I let go of sustain and stop generating notes, it's fine again, and its not exactly reproducible, but a lot of sustain seems to trigger it. I have touch curves way up, if that matters. Hum, probably wouldn't hurt to recalibrate and re-save, would it?