Does anybody know what orchid this is?

[Suse]

Dear All,

I bought this orchid just over one year ago. I think it might be a Miltonia hybrid, but I am not sure. The plant has been doing very well until recently. It has grown three new, plumb-looking pseudo bulbs since I got it and the new bulbs have developed three flower spikes each! The plant still is in bloom (the blossoms have a lovely clove scent), but I am a bit worried that it is not doing so well any longer.
The bulbs look quite shrivelled now. I thought I have been careful when watering it - waiting until the pot got lighter, but maybe I was to generous with water after all. I have taken it out of the pot today to have a look at the roots and they look brown and are a quite soft to the touch. The leave on the old bulbs are turning yellow (but I think this is normal, isn't it?).
I am trying to find out what plant I have exactly in the hope that I may find details on how to care for it properly so that I can rescue it.
If anybody knows what hybrid this may be and how I could try to nurse it back to health I would be really grateful to hear from you!!!