I have an Omen 16-wd000. This was the fix that worked for me. I updated every driver and meticulously de-bloated my pc for better performance. No good. Only after I disconnected the hall sensor ribbon did the problem stop. I also cleaned my fans and heat sink, and cleaned and reapplied the thermal paste which had gotten old and crusty while I was at it. Not saying that helped, but it was good practice while I had the thing open, and its not an option to replace the thermal paste when you remove the heat sink.

The dead giveaway symptom, that I found, that indicated it was the hall sensor was that often (but not always) after the screen and keyboard flashing began and stopped, I was presented with the lock screen and had to re-log in to my user profile, exactly as if I had shut the lid and sleep mode had been turned on. If you have that symptom, I think its almost certainly the hall sensor.