Now with a picture to show this issue. The clear square is due to a diagram on the page before...
'Anyone else noticing poor screen performance in strong sunlight?
My A5 screen becomes very mottled only with bright direct sunshine. Like heavy ghosting. It disappears if I change app, then back again (which I imagine triggers a full refresh).
I haven't had this on any of my previous readers (Kindle/Pocketbook/Onyx). Googling around, early e-readers had this issue and it's been a problem on the new Onyx Nova 2 which they've fixed via a software update.'