Sick Vanda

[mica28]

I'd really appreciate some help figuring out what's wrong. I bought this Vanda a little before the Mother's Day weekend. In a previous post on this forum, I thought I was dealing with a root issue because one of it's new roots started turning brown. After some discussions I found out I was over watering the plant by feeding it daily instead of once a week. So I stopped watering it daily as of yesterday.

Despite that, today two leaves just fell off the plant. They had turned yellow over the last few days and it looks like the others on the stem that are next are also starting to turn yellow. There seems to be black dots on the stem, and there seems to be some browning where a previous spike of the plant was (FYI that was not cut by me, it came to me that way). I'm not sure what those dots or brown stuff is either.

Have any of you had this/ these issue before? If so, what could the issue be? Should I contact the nursery?

These two images show you the current state of the plant:
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- Updated with working links