My dark blue PRS-505 fades only when it's extremely hot to the touch (135 degrees F/57 C). At 115 deg. F/46 C there's no fade. The Sony manual states an upper operating temperature limit of 95 deg. F/35 C.
So no, I don't consider my PRS-505 to fade in the way that I think others have experienced. My MP3 players typically don't work correctly at such temperatures. When the device feels hot enough to "melt" the letters, then that's something different from the fade we're talking about, I would think.
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