This is happening to my kindle after an update yesterday (5.12.5), is this normal? When I leave the book and the screen refreshes itself it goes back to normal : r/kindle
How to identify your Kindle model at a glance
Kindle Firmware Update 5.12.1 Released - The Digital Reader
Drobna aktualizacja 5.12.2.2 dla Kindle 7 oraz Paperwhite 2 | Świat Czytników