I am experiencing random reboots on 2 of my rigs. What can I do to check what is causing these reboots? What logs can I look at or enable? I'm running off a Sata drive instead of a USB stick so I am OK with it writing out log files.

I had the rigs over clocked but have since removed all over clocking and it is still having reboots. Anywhere from 3 - 10 reboots a day.

Rig 1 is 6 470 4gb msi armor on a tb250-btc mobo.
Rig 2 is 5 470 8gb msi armor on a tb250-btc mobo.

Any advice would be much appreciated. I am pulling my hair out over these things. I have 6 new risers coming so I can swap a few out to see if that helps.