I noticed the same on my holidays in Thailand, 30 degrees celcius and bright sun, after a while of reading outside without cover the pages would start looking "bleached", progressively so with each page turn. Closing the cover for a bit/moving out of the sun and back to black it goes. It doesn't seem to affect operation otherwise, and now back in cold NL it is fine as ever.
I don't really think it is a defect as much as it is a property of current e-ink tech.
FYI: Sony rates the 505 for 5 to 35C (41 to 95F) operating temp.
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