Princess Mikasa dropped all leaves

[Calvin]

I'm new here, and also to orchids - got my first about 9 months ago.

Among the beginning orchids was a Princess Mikasa, Blue. It's in a slatted wood container with coarse cork. It has been doing well, bloomed in late spring.

I water it weekly and mist between, light fertilize bi-weekly.

Within the past couple weeks it suddenly dropped all its leaves. What might have caused it?

If I leave it and continue watering is it possible it will eventually send up a new stem and leaves?
Should I cut off the existing stem or just pitch the whole thing?