My guess would be cold damage. I have a bunch of NOID complex hybrid Phalaenopsis and their tolerance (or lack of tolerance) for cold varies greatly between plants. If cold isn’t a possibility, sun damage would be my next guess. I’d try moving it to a warmer location or one without direct sun.
I purchased a Phalaenopsis with similar spotting this spring. The spots on mine progressed to sunken dry brown areas, but did not spread. New growth is unaffected. Unless you see the spots expanding despite “tweaking” growing conditions I wouldn’t worry about infection. If it does wind up being an infection, I think bacterial or fungal would be most likely.
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