Black Screen Issue

My system sometimes goes black screen instantly. If there is sound playing, It repeats for a while until goes black screen. What may cause it , and how to solve it?

What is your terminal output for

sudo lshw -C video

This sounds like graphics issue.

exiort@exiort:~$ sudo lshw -C video
description: VGA compatible controller
product: NVIDIA Corporation
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:01:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
configuration: driver=nvidia latency=0
resources: irq:85 memory:fb000000-fbffffff memory:b0000000-bfffffff memory:c0000000-c1ffffff ioport:f000(size=128) memory:fc000000-fc07ffff
description: VGA compatible controller
product: Renoir
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:05:00.0
version: c6
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi msix vga_controller bus_master cap_list
configuration: driver=amdgpu latency=0
resources: irq:48 memory:d0000000-dfffffff memory:e0000000-e01fffff ioport:c000(size=256) memory:fc500000-fc57ffff

This may be a switching issue between the onboard AMD and the Dedicated Nvidia graphics. If you use Nvidia on high demand, then when it switches, something is faulting.
I would try changing the Nvidia drivers (Software & Updates > Additional Drivers tab) or tweaking the on demand settings (/usr/bin/nvidia-settings).

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