my vanda spike died, why?

[nutgirl]

I got my Princess Mikasa last summer. My one and only vanda. It is in a glass vase and seems to be doing well. It has doubled in size and the root mass has filled the vase. I fill the vase and soak it every other day or so. It is fed with a balanced fertilizer weakly weekly. It started a flower spike last month and when it was about an inch long it turned yellow and died.

Is this something that happens to vandas? Is there something I could be doing to prevent it from happening again?

Maureen