What Oli says. The DSPs are interleaved, meaning one DSP serves all odd parts and the other serves all even parts.
Might be worth checking out what happens if you only use part 2 (, 4, 6, 8...) and whether the misbehavior stops. Likewise, worth checking out using only parts 1 (, 3, 5, 7...). If it crashes even with this separation of DSPs, there's a common denominator. If it crashes only on one set of parts then one of the DSPs is broken.
Have you already tried re-flashing the firmware?