KB 278692 Talks about the Type 1 Code 60 fault.
Basically you processor has detected a major fault and has cleared the Project and user memory.
As for what could cause that, there are many different reasons. I am pretty sure that a program error can not cause the issue. It is either a hardware issue or maybe a power issue. Lets start with the obvious:
Any power spikes?
Can you move the Processor to a different rack and see if the problem follows the processor?
Do you have a spare power supply that you can swap out in the rack to see if that helps?
Try any of these and see if you get any results.