Did you soak the new planting medium overnight before you potted your phalaenopsis into it? You could try watering with a 10 minute soak in tepid water each time you water. Take a pot or bowl deeper than your phalaenopsis pot. Set your orchid inside and fill around the plant with tepid water. You may have to hold the bark down when you first do this to keep the bark submerged. 10 to 15 minutes soak allows the roots plenty of time to absorb water, the medium usually absorbs some water, too.