760 i issues

Hello,



my psu 760i turning off by himselfe on system startup and turn on and off in a loop sometimes the psu works in Windows if yes he works normal in all load situations...



any idea for reasons, is it broken?



Thanks

Daniel



my rig: Asus Sabertooth Mark1/ 4790k/ 2xGainward 970 Phantom/16 GB Dominator Platinum / 8.1 64