Wearing out my Kobo ???

I know that e-ink devices do degrade over time . . . but my Aura Edition 2 is only about 13 months old and appears to be fading. The text still looks clean, but the shutdown images are all starting to fade - mostly losing contrast. When I examine them with a magnifier, they're noticeably grainy.

Is this common?

FYI, I read a LOT - a couple of hours a day EVERY day normally. I don't deliberately mistreat the reader (ie, leave it on a sunny car seat), but I'm not particularly careful about the environment.

Thanks!

Dan