Leaf yellowing overnight

[Kingak]

Hello,

I noticed that one of my otherwise healthy orchid’s leaves started yellowing overnight from the tip, it’s not the oldest leaf, and when I checked the plant last night all the leaves were fine. This orchid hasn’t lost any leaves since I got it in May. I watered it a couple days ago and nothing in its environment changed..


I’m wondering what could have caused it and if it’s something I should worry about?

Thanks!!