I had this problem today, I was outside reading my black 600 and my screen was okay for the page I was reading and the next. By the 3rd page the text was looking a really faint. I moved the reader into my shadow and it got better. My 505 doesn't do that and I haven't read my silver 600 outside yet so I'm not sure if there's somrthing I can do to fix it or whatever.
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