A couple of the biggest culprits for what you are experience when it is hardware related are either bad or mismatched memory. Did you use memory from the QVL list for your motherboard. Or potentially a failing power supply.
This is assuming the instability isn't self inflicted by having one or more components not at defaults such as overclocks etc.
I suggest resetting your bios to defaults and seeing if that helps stability.
The odd thing is that is this really only happening with just Netflix?
Also how are you running netflix. Are you using the Windows 10 app store app or are you using it in a browser? If in a browser, have you tried from another browser? Also have you tried disabling hardware acceleration in your browser. If that helps it may be more GPU than cpu or system related.
Please respond if your system is at defaults and with your full hardware specs and we can go from there.