Angraecum Sesquipedale spots, help???

[kiki-do]

Hi All,
My Angraecum Sesquipedale has developed yellowish spots on some of the top leaves. I recently posted my slipper showing spots, but these spots are more pronounced and I've only noticed it the past two weeks.
Anyone have a clue as to what this is and why it's like that? Another thing to mention, the nighttime temps are about 55 degrees, and sometimes the daytime temps are in the 80's because it is in a sunroom. Is that too drastic a change perhaps? Thanks for any help.

[kiki-do]

I have to bump this back up to the top in hopes someone will help me with this. Anyone?

[Tindomul]

Have you checked for insects? What kind of fertilizer are you using? How much light is it getting?

[kiki-do]

I am using the HD bought orchid food that I use for all of them. It gets medium light. As for bugs, I don't have mealy bugs or scale. I don't notice anything with the naked eye, so not sure if it's got some tiny thing that I can't see. Does anything come to mind when you looked at the pics? Too much light perhaps? The light is getting stronger now, maybe that? Just wondering if this was typical markings or something else.

[Dorothy]

Have the leaves stayed wet over night?
Does it get any air circulation?
I can not say for sure but it might be fungal or bacterial .. but again .. don't quote me on that ..
Perhaps others have had experience with this