Z170 pro gaming random reboot

Darkblocus

Commendable
Jul 6, 2016
6
0
1,510
HI everyone, this is my build :
Mobo : Z170 pro gaming
CPU : i7 6700k
CPU Cooler : NZXT Kraken x61 (pre-applied thermal paste)
RAM : hyperx fury 2133 Mhz 8x2
HDD : Western digital blue 1To
Case : NZXT 450 noctis white
PSU : corsair rm850i

After upgrading the bios to the latest version 1805 downloaded from asus.com, the pc reboots randomly (after 5h of use, 1hour, 10 or 20 min) and that's really unbearable... could anyone help me? i tried to downgrade the bios by using older versions of the bios but it refuses to.

N.B. : everything else is stable, i checked the temps, voltages using aida64 and cam software. Ah and Also, when i suspected the windows 8.1 64bits to be the cause, it rebooted even in the uefi mode which led me to the conclusion that the bios is the real problem.

New event : Yesterday, asus lauched their new bios update the 1901, i applied it and unfortunately, the problem is still the same, the pc reboots after 1 hour of use or so.
 

Darkblocus

Commendable
Jul 6, 2016
6
0
1,510
yep, i solved the problem : The reboot problem was caused by the corsair rm850i > the 0 rpm feature wasn' flawless : until reaching the 40% of 850 watt = 340 Watt, the fan doesn't start ( actual watt consumption < 150 watt), as a result the temp of the psu increases until 44 °C (the psu shutdown as a safety process and reboots everything). the solution is to change the fan options in the corsair link software by choosing : Mode : Fixed % =40 or 50% = 880 rpm and the psu is at ease 27-28°C.
 

Darkblocus

Commendable
Jul 6, 2016
6
0
1,510
Unfortunately, the problem showed up again ... the temps are all good. Now it's showing the anti-surge triggered message : Surges detected during the previous power on. Asus anti-surge was triggered to protect system from unstable power supply. Iread in some forums that the z170 pro gaming sensor could be too sensitive so i switched off the anti-surge feature but the problem remained. i'm thinking maybe it's the psu (even if it's brand new corsair rm850i ...) but i don't have another psu to replace it and do the tests.
 

Darkblocus

Commendable
Jul 6, 2016
6
0
1,510
it's not the cable nor the corsair link software cauz i removed both of them and still had "the Reboot". I think i'm gonna buy a new psu just to check if mine is faulty.