I spoke with a tech support guy. His suggestion was trying a different plug into the PSU (because the game had run fine for a couple of months after removing it from a 4-way adaptor) or plugging the monitor into the motherboard and removing the graphics card.I actually did notice some performance issues when I upgraded from a 970 to a 1070.
Strange that a few 1070 users are having the issue.
After the call I tried the game in two different ways - played the game until it crashed and it lasted 15 minutes. Then loaded the game and it crashed after just under 30 minutes purely sitting on the menu screen. I'm going to email the crash dumps to them and hopefully get a response on Monday.
@Plotinus @chintoo02018
I'm gonna give this a go and see what happens.Something to say below for overheating