Some details in addition to what Logseman and kacir already said.
After a research for a similar issue some of my clients had, I came to know that the producer of E-Ink screens (PVI who makes screens for many ereaders brands) confirmed that about 2% of all screens are fading while reading in the sunshine. If you have a screen fading it should be replaced under warranty.
The problem is supposed to be solved by manufacture in mass production starting next month.
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