Diversification;
Just to add another observation to takata's post - at 2h13min the aircraft was descending through FL175, deeply stalled, making uncontrollable roll oscillations left/right.
A similar temporary 'computing' condition may have occurred during the uncommanded pitch-down of QF72 - from the ATSB interim report on QF72:
In summary, the PRIM PITCH FAULTs and PRIM 3 FAULTs that occurred during the flight were consistent with the system design. They were consequences of the pitch-down events and not the initiators of those events.