Species Cattleya new growths dying

[gdupont]

I have a Cattleya warscewiczii coerulea I got from Orchids Ltd back in 2020. Super vigorous grower!

Occasionally, though, a new growth will shoot up, and once it's a few inches tall it will turn dark brown / black and start dying back.

Any idea why? Pics included.

I grow it indoors year round (New England), dryer in the winter, wetter in the summer. Growing in sphagnum since I got it, repotted it last summer into fresh sphagnum.

This also occasionally happens on mature leaves, but much less frequently (last image). And when it does, I cut the leaf to the top of the pseudobulb.