Hi JWH,
My Yggy has been terrific for (almost) the entire time I've had it, including from the first song I played out of the box. I don't think you're going to hear much change after 100 hours, definitely not enough to go from glaring to terrific.
But I did have one short period of sound that I thought of as harsh or brittle, perhaps identical to your glaring. When I upgraded my server, I tried several different cables. One of the cables, a Goldmund, was quite unpleasant. Ironically, this was the most expensive cable I tried. I ended up with a Nordost Blue Heaven S/PDIF that I think cost $300. So before you send back the Yggy, I recommend trying a few different cables. If you have a regular dealer, I'd ask to borrow 3 of his recommendations. If not, I'd go to the Blockbuster Magnolia section and pick up an Audioquest that suits your budget.
Good luck!
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