So my friend's PC has been having an issue. When he plays games, specifically Roblox and Sea of Thieves, it will shut down. Everything turns off except the power button light. To turn it back on, pressing the power button doesn't work, you have to unplug and plug it back in. It was happening with his 3200g (APU) and I upgraded his processor (3600) and added an RX 580 and the issue still happens. Stress tested the GPU and CPU at the same time with no shutdown and temps weren't high (it wasn't overheating). Benchmarked the hard drive and it didn't shut off. Drivers and bios have been updated and still the same issue. He can play Minecraft (heavily modded), TABS, Brawlhalla, Risk of Rain 2, etc for hours without a shutdown. He can play Sea of Thieves for like 10 minutes before it shuts down and usually around 15 minutes to an hour before Roblox causes it to shut down. It is the motherboard? Not sure what's wrong. Any help will be greatly appreciated.