Out of nowhere my RX 580 has begun to give out when doing anything at all graphically intensive. It started with Microsoft Flight Simulator and CS:GO. When doing a benchmark and playing Alien Isolation it has also given out. Whenever this occurs, the graphics freeze for a moment then the entire computer shuts off. I thought it might have been a PSU problem since my computer was prebuilt but the LEDs cut off when the entire computer shuts off rather than them staying on for a period of time. My computer is still under warranty but I want to figure out what the problem is.