I had exactly the same issue and just got one of my SE846 earbuds replaced for free out of of warranty. I was actually expecting to pay the $270 flat rate repair fee but was pleasantly surprised when I got a replacement back with no charge. In my case it was the left earbud, but it was the same issue with a crack appearing along that seam and a small piece of plastic peeling back on the bottom edge to expose the internals of the earbud. Shure was very generous to replace it out of warranty for free (just under three years since I purchased them I think, no receipt), but maybe they're starting to see this problem develop, so now I wonder if that factored in. I had dropped them a few times over the years, but nothing that I would consider outside of the ordinary wear and tear that would be expected for any pair of earphones. Very happy with Shure's support, now I just hope the same thing doesn't happen to the other earbud!