what's happening to my pilosa??

[soonsuseong]

looks like it is my turn to ask for advice, as i have never seen this before. i like N pilosa or chaniana very much, nice looking pitchers and hairy stems. although they are highlanders, lots of people manage to cultivate them at lowland conditions, but i do find them very vulnerable. they seem susceptible to changes in environment and rot easily.

this plant that i have has been growing well but the sun recently shifted and it receive very bright 12-2 o'clock sun, and the leaves look a bit yellow. so i put it somewhere more shady and after a couple of days of really gloomy weather and lots of rain, the plant suddenly look like this.



the lower leaves turned all black very quickly and the upper leaves seem to be going the same way. however the tip is still nice and green. the moss is very soggy but i dont dare to change the moss to avoid upsetting the roots. instead, i put it somewhere cool and shady and stopped watering them. the growth tip is still ok.

it will take a long time to recover, i think. what do you guys think? what happened? i never seen this occuring in such a short span of time. too much water, root rot? or too much sun?