Out of curiosity. You said you've moved it, has it been moved to somewhere where it is getting more light? Or even more direct light?
Some phals (depending on the heritage) do not like do be under too much light at all, and can sulk as a result. Had something similar happen to one of mine and after repositioning it to another room, it got better. I lost a leaf, but the rest were fine. Though on mine the leaf was half way. That was 6 months ago, but it seems fine now and has even re-bloomed.
I have a few noids and each seems to have their own quirks as it were.
Just a thought.
Hope it's nothing too serious though.