I'll give it a try when I can ... but I am pretty sure that's not an accurate determination. I mean if New World can brick a video card, apps can cause a system to reboot due to triggering something. While I realize this isn't new world but I've had this same problem with FF14 before on a completely different PC. I stopped playing around Stormblood originally because of it (at some point there was a patch around that time and it started having stability issues).
I suspect it's some application I use that ff14 conflicts with.
In the short term, I've found that if I run ff14 in full screen mode using dx11 it seems to be "stable" (not run long term testing). If I switch back to window/borderless with dx11 it reboots almost instantly.