I've only had mine for a few days but had noticed the ink was less "contrasting" than it had been but chalked it up to eyestrain due to massive reading and playing around.
Then it decided to restart in the middle of a document (well, it is a Sony product after all). After a couple minutes so it could reindex (about 1500 items in it---lotsa maps and manga) it came back and was clearly brighter than it had been before. Clear enough that a friend saw it a few minutes later and asked me how many of "these things" I was going to get.
Perhaps every now and then it just has to clear out its head. Hope that's all that is wrong with yours.
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