Too cold, too wet??

My question what happened here.
Within 14 days you can see puddles and spots appear on the leaves. Masdevallia scabrilinguis dropped almost all the leaves. At my Masdevallia filaria you can see puddles and spots. At Lepanthes dodsonii, spots appear and then the leaves shrivel. All circumstances haven't changed, it just got cooler. I water at five o'clock. There is a lot of air movement. Almost all leaves move more or less. LF is 75% to 95%. Temperature 12.5°C to 19.5°C
I know these plants all grow between 1500m and 2100m. That would be temperate temps.
Can the cause be too cold and probably wet leaves? Or could there be other causes.

 

Marni, thank you very much for your repley!
The second photo is from M. scabriliguis. I had some problems with false spider mite this summer, but I tackled that problem.
I water my plants at 5 pm. And I think that this is the problem that causes these problems.
I am going to water them every other day and in the morning (about 9 or 10 am)
My misting device will be on at 4 pm for about 4 hours. To krank up the RH befor the night without wetting the leaves.
I hop that will do the trick butr I am afraid it will be to late both the Masdevallia's.

 

Thanks Chuck for the reply.
Glad to hear I am not the only one with this sort of problems, in the sense of "shared sorrow is half sorrow"

 

Thanks Kelly! Never thought about condensation drip

 

Thanks Marni, I will take out my magnifying glass again and will do an inspection.
And thanks for your encouragement. Sometimes I find it very frustrating and don't have that much patient at that moment. (flaw in my character )
But when I see one flowering again, like the Masdevallia constricta, it's a joy, big smile on my face. )