when i turn off my s9, sometimes the screen flashes before the screen goes black, is this normal?

[Android Central Question]

it happens not very often but i don't know what it is i have explored the settings thoroughly but i can't seem to find a solution.

 

[Rukbat]

In any modern computer, including cellphones, with virtual screens, it happens. Not often, but it happens. I see it in my desktop monitor too, once in a while - not even when turning off, but when going from one web page to another - some third site shows for a fraction of a second.