h1sush34 developed a timing error at 09:45 PDT. I activated the IOP DACKILL and restarted all the models (MC2, PR2, SR2 and IOP), which cleared the problem. The IOP Watchdogs in turn tripped h1seih23 (h1seih45 was already tripped). 

The cause of the timing error is currently unknown. I'm leaving all systems tripped.