Others have suggested checking the roots and, in the process, completely repotting the plant. I think that's a good idea. It's notmal for a Phal. to lose a leaf or even two, especially when growing a new one. However, having just bloomed and now losing so many leaves sounds like a sign of real stress on the plant. It's quite likely thhat the medium the plant is in has broken down considerably and thus is not allowing the roots to get air and so to dry a bit between waterings.
What I would do is to remove the plant from its pot. While it is out, thoroughly inspect the roots. Clip off any which are dead or infected. You might even want to dip them in a fungicide and then rinse them thoroughly. You should also thoroughly wash the leaves while the plant is out so that you can clean off any dust or other stuff that shouldn't be on them. Repot it carefully, and if the roots are few or weak use a stake to add additional support for the plant while new roots grow. If the plant isn't stable in the medium it's not going to want to grow new roots.
Give it a bit less light than usual, though not too little, and watch for signs of new root growth. Don't allow the medium to get overly dry - arid - but you might want to use
misting more and watering less while the roots develop. If the leaves begin to wrinkle, though, you need to water more. Once the new roots start to come in you can put it back into the normal light level and it should recover nicely.
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