PC shutting down then restarting

Over the past month or two my PC has been shutting off for about 5 secs then restarting. It occurs approximately every week give or take a couple of days.
I've cleaned it of dust, checked the temps (all under 50C when the shutdown occurs), updated BIOS, checked for viruses, passed memtest86.

PC specs:
Gigabyte GA-X58A-UD5 rev 1 Motherboard
Core i7 975 EE Quad Core @ 3.33 GHz (not OC'ed)
6GB (3x2GB) Corsair PC-10600 1333MHz DDR3 RAM
GeForce GTX560 - 1GB GDDR5
Antec 1000W CP-1000W
Microsoft Windows 7 Professional

Any ideas will be greatly appreciated.
3 answers Last reply
More about shutting restarting
  1. pad power feeding the PC from the outlet? Do you have a line conditioner or UPS you can add between the PC and wall socket?
  2. No, I do have a power surge protector. However I've had this problem when also using power at a different house without the surge protector.
  3. not a surge protector. Line conditioner or UPS.
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