You have a beautiful Phal! After the length of time it has been blooming, it is normal for the flowers to fade and fall. The bud blast could be caused by any number of things, changing temperature and humidity between your space and its previous home, differant minerals in the tap water, diferant light levels between your home and the store, getting too much sunlight through the window in your car on the ride home. Anything! So far its actions are normal for a phal. Looks like you have a good pot with plenty of holes to provide air to the roots. Is it planted in tightly packed sphagnum moss, or is the moss loosley tucked around the roots? Do you let the sphagnum dry completely before rewatering?