i've noticed, over the last few months, that my Kitayama is softer and more prone to damage, than it used to be. it still cuts fine, and leaves a nice edge, but a tenacious burr can easily gouge the surface, instead of grinding off or being grabbed. admittedly, i use my Kit different from most, as i use it straight from a 3-4k stone, but still, it was never an issue before. i'm guessing that this is due to magnesia soaking out of the stone, though i've been careful with it. i've had the stone for a couple years, i'd say, and it's been used heavily. i'm still going to use it, but only for edge refinement, as needed, or for touchup: i just bought a Gesshin 8k to replace it for heavy use. has anybody else experienced this issue?