mining rig shut down

Hello again all, I have a GPU mining rig that I am having issues with. The summary is this: one specific PSU from the rig will predictably power down at some point once the mining rig starts drawing increased power. The end result is that only half of the GPUs and the motherboard remain on...

ive had my mining rig of 5 RX580 red devils, 1950watt PSU for about a year, until one day they stopped working. I have 8gb ram i have a i3-4160 CPU and 5 red Devil Rx580. I have changed Virtual memory to different things such as 8000 initial and 16000 max, ive done 16000, and 16000, ive done...