Question Computer restarts when I launch a game

Jul 27, 2019
So basically this problem started a few months ago I would launch a game and sometimes my computer would just restart no blue screen no error msgs nothing. Before all this I had overclocked my system. The RAM, CPU, and GPU. It all work just fine and I enjoyed increased performance before all this started. Fast Forward the restarts have become much more frequent. So I watch the CPU temp and its bouncing all over the place. So I assuming its the cooler going bad. I replace the liquid and it seem to work for a day, but I was still having the same issue . After all that I reinstall windows hoping its weird bug and remove all the overclocking that I did. And that brings us to today I ran a Windows memory test and it said It found errors in some of my RAM so I pull out the 2 sticks of 2gb ram and run the test again and all seems normal. and the problem remains. But my CPU temps are no longer jumping up and down its stable at around 35C. So I just have no idea on how to move forward. My computer runs fine at Idle and Im even typing this out on the very same machine. So where do I go from here?

Operating System
Windows 10 Pro 64-bit
Intel Core i5 4690K @ 3.50GHz 33 °C
Haswell 22nm Technology
16.0GB Dual-Channel DDR3 @ 799MHz (9-9-9-24)
MSI H97 PC Mate(MS-7850) (SOCKET 0) 37 °C
ROG PG278Q (2560x1440@60Hz)
VE248 (1920x1080@59Hz)
8192MB ATI AMD Radeon R9 390 Series (Sapphire/PCPartner) 46 °C
232GB Western Digital WDC WDS250G1B0A-00H9H0 (SATA (SSD)) 30 °C
1863GB Seagate ST2000DM006-2DM164 (SATA ) 38 °C
931GB Western Digital WDC WD1003FZEX-00MK2A0 (SATA ) 41 °C
931GB Hitachi HDS721010CLA332 (SATA ) 40 °C
Optical Drives
No optical disk drives detected
AMD High Definition Audio Device