Question Computer locking up completely after some use

[cxzleslie1]

My two-month old computer has started locking up completely while playing games like Rainbow Six Siege for about 15 minutes, to the point where I have to force restart the computer. I have tried reinstalling all my drivers, my temps while gaming look alright at around 60-ish degrees, and reinstalled Windows, hence I suspect it could be a RAM or GPU issue.

I ran MemTest86 last night which froze after 3/4 passes, in which the log showed me this:
2019-06-08 03:23:33 - RunHammerTest - Running hammer test on 4 CPUs (128MB each) [0x1E0000000 - 0x200000000]
2019-06-08 03:23:35 - Memory range 0x8000 - 0x58000 was not locked. Ignoring...
2019-06-08 03:23:35 - Memory range 0x59000 - 0x5F000 was not locked. Ignoring...
2019-06-08 03:23:37 - Memory range 0xCDF04000 - 0xCDFBB000 was not locked. Ignoring...

Quite baffled as to what is happening as this is a very new system, help would be appreciated.

Specs:
Processor: Intel(R) Core(TM) i5-9400F CPU @ 2.90GHz, 2904 Mhz, 6 Core(s)
BaseBoard Manufacturer Gigabyte Technology Co., Ltd.
BaseBoard Product H310M DS2 2.0
Installed Physical Memory (RAM) 8.00 GB
GPU NVIDIA GeForce RTX 2060

 

[rgd1101]

make and model of the psu?
60c is the gpu or the cpu?
latest bios? fresh os install?

 

[cxzleslie1]

PSU is a SeaSonic SS-520GB Active PFC F3 80+ Bronze

BIOS Version/Date American Megatrends Inc. F10, 20/9/2018
SMBIOS Version 2.8

Have yet to test my temps in detail but around 60-70C for GPU

As for fresh OS install I resetted the drive the OS was installed on