Hello, I have been having this issue for a week or two where my PC restarts mid gaming, Sometimes it restarts as soon as I start a game, sometimes after 2-3 hours. I already tried various things such as swapping my PSU, GPU I also tried Updating my GPU Drivers and Chipset Drivers.. But none of them seem to make a difference. But the thing is when I try stress testing my CPU and GPU everything works perfectly meaning it doesn't reboot or shutdown. I did many times same result. I can't say if this is a software issue or motherboard.
SPECS:
Core i5 6400
rx560
16GB RAM (forgot the exact name)
Thermaltake Litepower 550W PSU
Games tested on:
Rainbow Six Siege
A way out
Farcry 4
Farcry 5
Benchmarked on:
Benchmark Heaven
Cinebench