You mention a "plastic casing" that your plants are in, inside of the cache pot. Would this be the original container that the orchids were in when you bought them? How much ventilation does the plastic casing have? Just one hole at the bottom?
I ask because, if it is the original thin, cheap plastic pot that many commercial growers provide, it probably does not provide for much air circulation. That, coupled with being inside a tight-fitting cache pot, could mean that your orchids are not getting enough air to their roots.
Aliceinwl mentioned the clear, slotted plastic pots from Repotme. I really like those, too. There are multiple drainage holes at the bottom, as well as slots up the sides for even more ventilation. The only downside is that roots will eventually grow out all of those bottom holes and the side slots, and you probably will have to cut the pot off the next time you repot, but to me that is well worth the price of a pot if it means my orchids are growing happy and healthy.
Also, you might want to experiment with using a cache pot that doesn't fit so tightly. I only use cache pots for my largest, heaviest orchids, and I have those in a clay pot that leaves at least a half inch of air space between it and the inner plastic pot. You can even find clay pots or pretty ceramic pots that have holes in the sides especially for orchids.
For my orchids that are just in the plastic pots without a cache pot, I use a matching clear plastic saucer. It has several depressions in it that will catch any excess water running out without allowing the pot to actually sit in water.
Also, I think you've indicated that you've already learned this, but make sure to heed Roberta's advice about the potting material. Soil, even as part of a mix, is a no-no for the vast majority of orchids.
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Cheri
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