If disabling OCP protection resolves the issue it means you are actually experiencing overcurrent and the PSU turns off. There are two possibilities here, either something is shorted on your board or the PSU is faulty. TRIPLE check the board for anything shorting..any piece of metal touching something it shouldn't etc. If you see nothing like that, RMA the PSU.
Running your system with the OCP off when it's obviously kicking in, is a recipe for disaster..best case scenario you will fry your hardware, worst case scenario you'll catch a fire..
EDIT: One extra thing to test is USB, Front panel Audio, etc case headers. This can happen if they're faulty and shorting.. so remove them all and test.
OP , have you tried increasing your System Agent (SA) Voltage?
I got a 4x4 64GB Patriot Viper Elite 3000 XMP kit at FRY'S last week and was getting random computer reboots in games at the 3000 XMP setting.
The system agent (SA) was running on Auto, which was roughly .945v. I manually set the SA to 1.05v and it fixed all the random reboots.
Was it reboots or shut downs? Because I was getting complete shut downs as if someone had pulled the plug.
It would shutdown and reboot. Seasonic 1000 PSU makes a distinct clicking noise from on/off. One could clearly hear the click, but it would reboot after it shutdown. I was able to get 3000XMP stable with 1.0375v System Agent in bios with a 1.05v System Agent load reading in windows.