Sometimes you get a plant that just refuses to live for no reason that can be determined. I have about 35 phals and a work acquaintenance found this out and noted all my beautiful plants at work. She asked if I could take her white phal that had not bloomed in three years and bloom it for her. Since all of mine had been doing great (and still are) I agreed and brought it into the family. About two months later it did EXACTLY what you are describing. The leaves all fell off at the crown in about 1-2 days and IT WAS OVER. I could not believe it! I did nothing differerent with it than all the rest. What could I tell her? In retrospec, there must have been a population of disease organisms that had multiplied in the crown area of this plant prior to my acquisition of it that reacted totally different than my other plants. This was about a year ago and nothing even remotely similar has happened since. So - might not be anything at all you did.
