ThanksYour orchid is probably over-watered. These plants are prone to root rot when you water them too much. In the winter time they also need a rest from being fed. Even though your winters are definitely milder than ours in the UK. I suggest you take the plant out of its pot and check the roots to see what is happening. You will soon know if they are rotting. If they have any good root left, cut away any rotted bits and replant in fresh orchid compost.
When you have done this leave your plant to recover and wait a while. I will keep my fingers crossed for you.
If the plant survives, remember to let it dry out completely during the warmer months of spring and summer, and then water thoroughly allowing the water to completely drain away. Never let it sit in water - ever.
The spent stems should always be removed. When your plant flowers again it will be from new stems, usually two leaves above the present ones. As for the first watering, only if the root is very dry - then leave the plant to dry again completely before watering again.
My own orchids like to be next to a window facing away from direct sunlight.
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