Miltonia - Leaf die back

[Faan]

I have a Miltonia Anne Warne, but I have noticed over the last year that the leafs are dying back and I have no idea of why this is happening. To me it does not look like it is the typical end of the leaf's life spam, but something else that is wrong. Is there anyone with any idea to the problem.
Two pictures attached to show the problem.

[Des]

That looks fungal to me , Cut those portions off with a sterilized knife and seal the ends with sulphur or cinnamon .Then spray the plant and those around it with a systemic fungicide. Repeat the spray with a contact fungicide every two weeks for the next few months , oh and don't forget to use a wetter in your spray mix.
I would also try and give the plant a boost by giving a plant booster of some sort . I would use Superthrive