Screen goes black for 2 seconds or screen blinking or flickering on HP Envy x360 15z 15z-Ee000 CTO

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I have HP Envy x360 15z-Ee000 CTO.

With AMD Ryzen 4700U.

The screen goes black for 1 to 2 seconds or screen flickers or screen blinks or winks, even when is under heavy use. This happens on web browsers, word or even notepad. It happens like every 5 minutes or so and happens while laptop is running only on battery. It might be happening with external power plugged-in but the frequency should be very low, compared to battery only.

All drivers are default or whatever is updated by windows. Windows is also up to date. 

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SORRY THE FOLLOWING EXPERIMENT HAS NOT FIXED THE ISSUES AT ALL. THE ISSUE IS STILL THERE.

I think this issue was caused by antivirus Norton360.

I reset windows on my computer and never installed Norton360 after that and it looks like the issue is gone. I am not 100% sure as I might have still seen a blink or wink of screen once in a while probably something else I looks like that this issue is gone.

Norton has released some tool (Screen_Fix.exe) to fix some issue that looks like this issue here Fix problems with desktop screen flickering after upgrading Norton

I have not tried this personally so far so I cannot tell if it will fix the issue with Norton360 installed.