Question repeated reboot + random shutdown on Alienware 15 R3 laptop

Oct 4, 2019
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hello,
i recently encountered a problem: my laptop suddenly shuts down (without showing a bsod) whenever i run graphic-intensive software located in my hdd for over approx. 5 minutes.(my main drive is a ssd and gaming on it looked just fine). my GPU drivers and BIOS are up to date and the GPU itself is not going above 80 at any time. i have done the drainage of the residual electricity, resat the RAM and cleaned out the dust but the problem still persists. sometimes after it was shut down, it is not able to complete the reboot and turns back off with a click sound in a few seconds. i have long doubted that it is a power supply malfunction but when i ran a detection before the boot, it showed that the power brick functioned just fine. i have done a through HDD scan and it showed that no badf sectors were present.
specs:
Alienware 15 R3--bought in December, 2017
Processor
Intel(R) Core(TM) i7-7820HK CPU @ 2.90GHz

Video Card
Intel(R) HD Graphics 630

Video Card #2
NVIDIA GeForce GTX 1070

RAM
32 GB Hynix

Operating System
Windows 10

BIOS
1.7.0

Manufacturer
Alienware

drive#1: KXG50ZNV256G NVMe Toshiba 256 GB (SSD)

drive #2: HGST HTS721010A9E630 (HDD 7200rpm)