You know, that would not surprise me at all.
I have not encountered the freezing problem again since discarding those specific three game saves, but I did encounter some crazy instability problems when I was doing an overclock session on my 1070 last night.
I was using AB's curve graph and a setting I had tried the computer did NOT like. bsod, and then got no video out of my graphics card for almost 20 minutes. resetting CMOS didn't fix anything. The video randomly popped back on after countless restarts. I was really worried.
Now, I do realize that this is something much different than playing Fallout 4 and freezing, but because it was AB, and I haven't experienced something like that before...it was definitely strange.
I might go back to Zotac's OSD if I have another issue. You should try it too. Zotac's is very nice except fan control is only dealt in percentages of 10. Kinda annoying but I think I can get passed it.