Miltoniopsis leaves limp and folding

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If they are squishy they are likely rotting. New roots are white but they can be healthy and still be brown as they age and pick up staining from bark and other types of media. But squishy or mushy is not good. I sometimes find it hard to keep Milts moist and not dry or wet. I don't have much luck with CHC which stays too wet in the interior of the pot for me over my cool winters in the greenhouse. But others like it. I would use bark and a bit of moss, but everyone's growing conditions are different.

It might help to put something chunky in the bottom like charcoal or leca (clay) balls for good drainage. Make sure they don't sit in water. Using some kelp (seaweed) enhances root growth really well on some orchids but I haven't found as obvious affect on my MIlts as I have on some like Cattleyas. It wouldn't hurt tho and likely would help.

Maybe someone else will have better advice. I have a few Milts and used to do quite well with them, but they have been going downhill for me so I haven't found all the answers either. Heat will definitely stress them especially if they are not in prime condition in the first place. Miltonias are more able to take heat but the Miltoniopsis (pansy orchids) prefer cooler conditions but not cold.