I have to agree with Aniko. Depending upon where the plant was purchased, if it was shipped as a mother's day type thing they tend to overpack with sphag. Mine was, and it was choking the roots. I gently pulled all out of the pot removed a few handfuls of sphag, and stuck it back into the pot to be repotted when it is done blooming. Almost two months later it is producing a new bud, and branch on the spike and two blooms still on it. It is common practice when shipping plants to a box type store so that they do not move around in the medium. A bad practice, but we have heard of this happening several times. I do agree with Jerry that you can repot with blooms on it if you are careful. Phals can be repotted any time, but you have to take care or the buds will blast.
