That flower spike looks as though it has come to the end of its life . Usually you can tell when this is about to happen if the labellum (lip) starts to change color. When selecting plants make sure that all the lips are fresh looking and have not started to change color . The only other reason , that I know of , for the lip to change color is if the flower has been pollinated. This can happen quite easily if you bump the anther cap off transporting it home. This is something that often happens to me when transporting plants to a show .
Hope this helps
Regards Des
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