Screen Bubbles on iMac 27" 5k (late 2015)

My late 2015 27" 5k is getting bubbles appearing on the screen

It has the appearance of the laminate separating from the screen (or an old tint job).

This is not the first time on this computer. This is my third screen since I've owned this iMac ( and was my first Mac).

I only use the cloth that came with it to clean the screen. No liquids used on the screen.

Is this something that is just a way of life or common with this model? I hate to think that I've gotten three dud screens.