Hi Chung Shih,
I'll only attempt to answer the first question. If the phal has been potted or repotted into a pot larger than the root mass, the plant will shift its energy into growing new roots. It will neglect leaf and flower spike development during this period.
That's why you'll commonly hear, don't over-pot orchids. That means, don't move them into a larger pot than they need. The roots don't want to be smushed in or over-crowded, but assume they want something of a snug fit. Too big a pot and you'll stall on leaves and flowers till new roots start to fill the pot.
That's the only answer I can think of for question 1. Others may have different thoughts.