Pc restarting randomly.

[Darkfire_71]

So I've got this pc like about 2-3 months ago and everything was fine until the pc started restarting itself and displaying this "Asus has detected power surges from previous start up." At first I thought it's because of temperatures however I've used Furmark, Rivatuner and on Furmark my highest GPU temp was 77C on Rivatuner playing some games I've got 50-55C and the restarting usually occurs when playing Fortnite while the battle bus starts going. And I've got one restart while playing GTA Online in other games everything seems fine. I should mention that this pc is a prebuilt and the specs are these:
GPU:  Palit Nvidia GTX 1070 Dual 8GB
CPU: I7-6700 3.40 GHZ
Case: Aerocool Streak Mid Tower RGB
PSU: Silverstone sst-st56f
Motherboard: ASUSTeK COMPUTER INC. B150-PRO D3
SSD: Samsung SSD 850 EVO 500GB, SanDisk SSD U100 128GB
HDD: ST500LT012-9WS142
RAM: 4 x 4 16GB

Pls someone help
Edit: A user commented on one forum that a HDD could be faulty and I've checked mine and I see that Fortnite and GTA are both installed into one drive. It isn't a big deal for me to grab another HDD and try to reinstall everything there if that is the problem. Something I should mention is that while doing furmark stress test if I minimize the window and right when I press on the screen to enter it again the pc reboots too.
Tried searching up on event viewer and I see this: Kernel-Power Event ID: 41