Hi again, just responded to the original post briefly. As I mentioned before you need to post some pics for us to give you better help, but it sounds like the roots are dead, and it may be because the plant isn't getting enough water. Now normally I repot mine as soon as I get them because I want to be sure that there is not rotting of roots in the pot. I believe that the pot may be keeping the media too moist, is it one of the glazed type? What kind of media is it in, bark, a mix of bark and something else or clay balls? Basically, if the media is too wet then it kills the roots, then there is nothing for the plant to absorb the water with inside the pot, so the areal roots ( the ones outside the pot) look dried out, and eventually the plant will become distressed, the leaves will get limp, the flowers will blast (die), etc. As scary as it may sound you may have to take it out of the pot to see if there is any root damage and repot.
The basics: Orchid Growing Mistakes to Avoid | River Valley Orchidworks
Hope I didn't freak you out too much, remember you can ask anyone here for help if you think of any other questions, and there are no dumb questions.