OK i found a reproducible CRASH !!
There were no verification on the incoming midi value for the number of voices. It was directly set on the instrument. It should have been limited like it is when you turn the encoder.
So if you set algo with 6op, number of voices to 4 and pushed it to all instruments (Global midi or same midi channel) it crashed.
If you're not too tired of trying firmware can you try this one with your global midi enabled ?
Thanks