Edit: Spoke too soon, just went silent again (not touching the unit at all, just same pattern playing).
Tried another Factory Reset, reloaded the project, but the sequencer will not trig anything.
I can trig the sounds manually. New patterns, changing samples, nothing gets the trigs playing again.
Unfortunately in this unstable state, this is completely unworkable, as I never know when I'm going to lose my work, and I can't seen to recover it at all.
2 hours solid with no issues after the Factory Reset.
DT as master, OT and AK slaved. Working wonderfully. (No USB)