ASUS Power Supply Surge Detected...

Aug 31, 2018
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So firstly my specs are:
- i7 6700k
- GTX 1070 STRIX
- ARCTIC Freezer 7 Pro Rev 2
- Samsung 850 PRO 256 GB
- LiteOn IHAS124-14 24x SATA Internal DVDRW
- Corsair RMi Series RM850i ATX/EPS Fully Modular 80 PLUS Gold 850 W Power Supply Unit
- Asus Z170-DELUXE LGA1151 Socket ATX Motherboard

I've had this Gaming PC for 2 years now, and never had a problem with it, only some minor problems. Suddenly I've had my PC rebooted multiple times randomly and pops up with the image I have attached (link: https://ibb.co/c4iJCz). I've turned off the feature where it reboots automatically, however, I am still worried something is wrong. What could it be? the socket? the PSU? I have a 8 socket extension, and maybe because they are all used, the PC is not getting enough power, I may sound stupid. I'm also worried that I didn't do something correctly when I was building it. Thanks
c4iJCz