This is just an anecdote since I haven’t been able to reproduce it reliably yet, but I’m posting it anyway in case someone has experienced this issue too.
I recently hooked up an external sequencer (OXI One) to the S6 and randomly hit a bunch of pads that triggered chord variations. The voices on the S6 soon went silent one by one and I had to reboot the synth to get them back.
After reboot, I did the same thing, and after a few seconds, the S6 went silent again.
I do not know exactly what MIDI messages the OXI was sending at the time. I used a midi monitor to find out but then couldn’t reproduce it anymore. I was hitting high notes when it happened, so maybe it produced an out-of-range error somewhere.
Hopefully, I can give you some more details later, but for now, I conclude that there must be a bug somewhere in the MIDI input handling.
Don’t let this delay the new firmware release though. I’m very much looking forward to that!