Dreadnaught Act 2 causing my entire PC to turn off

Hi all,

Basically as the headline says - I've played PoE2 for 500 hours across all leagues. Never an issue. I've played 12 hours of 0.5 so far, again no issues. In fact my buddy and I were discussing that the game felt smoother than ever before.

Until I tried entering the Dreadnaught.... where within 1-2 seconds my entire PC turns off as if unplugged from the wall. It does this every single time I try and enter the area. The game runs perfectly fine in every other area. It's not a heat issue, and I doubt it's a PSU issue (directly) as it ran PoE2 perfectly fine in much more stressful situations with dozens of mobs on screen and multiple ability effects dazzling the screen. I've tried other games this evening, all run fine.

Anyone else had this issue? Did anything help?