Welcome to the board and I'm sorry you're having problems with your orchids.
I noticed in some of your pictures there are fat, healthy roots and still the yellow leaves.
I've had problems like this several times and have never found the true answer, even with totally healthy plants and roots.
Picture number six looks like some type of cell damage. Cold water? Cold draft on them? Over watering, under watering? Too much light?
The best thing I can recommend is making a check list of everything pertaining to their culture, starting with a look at their roots and potting medium.
Have you sprayed them with anything? Could they have bugs of any kind? Mites? Too much fertilizer?
Sometimes it takes a lot of questions to find the right answer. Good luck and please post on your findings.
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