One unhealthy Cattleys skinnery var alba

[Henke]

This one isn't doing to well I think.
I need to know whats going on and how to stop it.

history:
The plant was bought a year + ago. Bloomed last summer and seemed to be healthy. No obvious signs of unhealth, even have 2 possible blooming things.

The plant face west in a window, normal inhouse. Watered reguary, sparely until it spikes. No change in environment or handling.

Now all of a sudden one of the upcoming spikes dried out and it gets black. Same with another of the bulbs. It's starting from top and going downwards.

A couple of pics is posten on the links.

Anyone have any idea what it causing this and how we can stop it.

Is the plant doomed

//Henke