I have the exact problem and found the source of my problem was the magnifying glass with light app that I got from the play store. I really needed to keep the magnifying glass because apart from the ads they are very useful. I added AdGuard to remove any and all ads and I am without any complaint.
The last time I saw this, it was actually the Peel Smart Remote that was causing the problem.
Try to force stop and disable the app in Settings to fix this.