Hard drive crash and reboots for no reason

With one SSD attached the system consistently freezes after about 4-5 minutes of use. Using Windows on the same machine, it's completely stable. I'm not sure how to diagnose this issue. Any ideas would be welcome.

This Hackintosh has stable for some time and I haven't upgraded since El Capitan.

The hard disk is formatted with both mac and pc partitions, both of which have systems installed.. not sure if that's related. Maybe it's finding something on their while indexing and somehow there's a conflict?

submitted by /u/newandgood
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