Bdo and shutdown plx help

[Aleksus]

I Think i have a Problem?
First my system
i7 4970k stock clock (idle 29c max 50c)
16gb Kingston Fury Beast 2133 Mhz
Asus RoG Maximus Hero VII (vrm idle 49c max 60c) (Mobo idle 23c max 35c)
Asus RoG Strix Gtx 1080 ti (idle 36c max 66c) Driver vers. 416.34
2x Samsung Evo 850 256Gb
Raidmax 850w Gold Plus
Windows 10 pro 1809
I like it cold and stock for long life components so my problem is before i played ultra modded Skyrim 5-6 hours nothing running Heaven benchmark for 1 hour nothing everything runs perfect and i started playing Black Desert Online on ultra eze so playing the game like couple hour no problem now Come the weird part when i chill looking in the marketplace like 20-30 min Cluck Shutdown/reset like my electricity turned off on the pc and Pc started back up to windows like nothing happened(scary) after that i run benchmarks again nothing i usually run in nvidia setting power on optimal power and my Pc in power manager is on Balance because i don't want to run it like 100% all day even if i just watch youtube i tried setting it on max power run the benchmark like 1 hour again still nothing (got 400 points more) No overheating not even close ( i am running AI suite 3 & Asus GPU tweak II btw.) What could it be? Please help! thanks in advance

 

[Dark Lord of Tech]

Any Raidmax PSU should be replaced , horrible quality. Not saying it's the issue , but they are very poor.

 

[Aleksus]

Any Raidmax PSU should be replaced , horrible quality. Not saying it's the issue , but they are very poor.

I Got it on Sell about 4 year ago with a 3 year warranty and never had problems with it, had not much to choose from where life back then. But still just played the game like 4 hours nothing but could be hardware problem leaning more to psu the 1080ti i got it like 3 months ago but before that i had a R9 390 sapphire and it was heavier on the watts then the 1080ti!