Well folks. Fortunately my story has come to a positive end. I had been having worse and worse random restarts with my 6850K , RVE, 4X16GB = 64GB DDR4 3000 Patriot , 1080Ti FE SLi setup for the last 4 months. The last 2 months it was so bad that every single time I played BF1 after about 1 minute, boom a random restart. Always during high gaming loads.
My Seasonic 1000W platinum had been used almost everyday for six (6) years between everyone in the house.
Ran across this thread about 1000W PSU's with 1080Ti' FE's in SLi not being enough and decided to take a gamble...
http://www.overclock.net/t/1628560/sli-1080ti-causes-reboots-while-4k-gaming-solved-1000-watts-not-e...Bought myself a new Corsiar AX1500i PSU. Not a single random restart on any of the new 3000 series bios for the last 10 days, currently on 3701 and actually the whole PC runs a ton smoother now. Safe to say... problem solved.
I think there are two different Categories for the random restart issues.
For some: Random restart during IDLE = cause not entirely known for many.
For others: Random restart during LOADS = Seriously consider getting yourself another PSU to completely resolve the issue.