Why is a random app keep popping up and then closes itself after a second?

[an addict]

Since I updated my HTC U Ultra to Android 8.0, an app with a white screen keeps open and close itself after a second. Also I couldn't figure out which app it is, since it's not listed in the task manager. It has been bothering me for awhile now and I wanted to know how to fix it, since I couldn't find anything on the internet

 

[Rukbat]

White screen with what on it? Just a blank white screen?

 

[an addict]

It's just a blank white screen

 

[Rukbat]

That's probably the screen coming on, not an app. It shoouldn't, but updates sometimes have little bugs that don't get caught.