System power cutoff unexpectedly when running unigine-heaven benchmark

On Dell Inspiron 5300 machine with nvidia graphic card embedded.
The system will shutdown when running unigine-heaven benchmark. It takes less than 10min to reproduce the issue.

Reproduce rate: 100/100

Reproduce step:

1. select nvidia card to render(performance mode)
2. download phoronix-test-suite from https://github.com/phoronix-test-suite/phoronix-test-suite
3. ./phoronix-test-suite run pts/unigine-heaven
4. interactive console pop-up:
   a. select 1920 x 1080 resolution
   b. select Fullscreen
   c. it is okay to disallow or allow store test result
   d. start running unigine-heaven benchmark
5. The benchmark runs for less than 10min
6. The system power cutoff without any further information
---
ProblemType: Bug
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
DistributionChannelDescriptor:
 # This is the distribution channel descriptor for the OEM CDs
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-bionic-amd64-20190418-59+beaver-osp1-samwell+X42
DistroRelease: Ubuntu 18.04
InstallationDate: Installed on 2019-12-13 (230 days ago)
InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 20190418-12:10
NonfreeKernelModules: nvidia_modeset nvidia
Package: nvidia-driver-440 440.36-0ubuntu0~0.18.04.1somerville1
PackageArchitecture: amd64
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 5.0.0-1032.36-oem-osp1 5.0.21
Tags: bionic
Uname: Linux 5.0.0-1032-oem-osp1 x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True