Note 8 flash occasionally like power cut

[Android Central Question]

Usually a couple times a week I will see my note 8 phone flash like the power was cut for 1 second. This also happened on my note 7 and I thought it would go away with new phone. It comes right back but its annoying. Like some 3rd party is screenshotting my phone or there is a power surge. HaS anyone experienced this. I don't like it and I'd like to get it resolved because maybe it's some sort of virus or spyware in am app that transferred when I changed phones. Tia

 

[chamomiami]

No in my Note 8... for sure is an App doing that