PC powers down during cutscenes.

[silverlunarfox]

All I can think of is, a surge protection being tripped somewhere, check your PSU and see if it's capable of supplying power to the unit under max load, also check if power connectors are properly seated on the GPU and Motherboard, lastly, if you happen to have a PSU that can supply more power than the one you currently have, try that one.

There's a sound it makes on both videos right as it shuts down, and to me it doesn't sound like a normal powering down, it's immediate loss of power from the PSU, it's very similar to when you pull the plug out of the wall with your unit running.

I second this. This sounds of a hardware failure.