I'm using this Nokia 8 mobile for 4 months.
Suddenly I found screen burn issue in this mobile.
I was editing a picture in this mobile, then I moved to another window.
The page which I used before appears on the edges of the mobile with the navigation bar.
Yes, you're not alone. Quite a few people have it. My guess is that Nokia HMD used the cheapest displays they could find. It's an unnecessary disappointment. I just yesterday advised a friend who needed a second phone against buying Nokia.