Leaf die-back, S/H Phrag. schlimii

[theorchidapartment]

I received a very healthy and established Phragmipedium schlimii from Ecuagenera about a month and a half ago, which I put directly in semi-hydro.

It was in bloom with more buds on the way; most of the existing buds bloomed, though all flowering now seems to be over. I can see new roots and what I think is the start of a new growth, but in the last week or so, I've noticed leaf tip die-back and yellowing on maybe a quarter of the leaves. (From what I can tell, it's the oldest leaves across a number of growths.)

Since this is my first experience with both Phrags and S/H, I'm anxious that I'm in the process of murdering this plant! What level of leaf loss is acceptable in the Phrag life cycle and/or transition to S/H?