As to why it happend. Well I had one which I repotted April 2008 and when I went away for a week in July 2008 it suddenly went hot and I came home to an almost dead plant. Turned out it had almost no roots.
The next two I repotted I watched more closely and it was quickly evident that their roots were also dying.
It turned out to be the medium I was using. It was already decaying in the bag when I bought it, but I was not experienced enough to realise this. When the second two started going the same way I got brand new medium from an orchid specialist and repotted them, they started to recover and the ones I have potted since in the better medium have not had the same problems.
As for the first one... It struggled for a long while and I tried lots of methods for saving it but it only started to actually recover once I got it in the tiny pot as I mentioned in the previous post. Now it's in flower... and it's current flowers are my avatar just now.
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