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we will never know the situations of a sudden temperature rise...
but the oil crawls out and don't go back... it can be cumulative during those sudden hot days and power outages prevents you from using an air conditioner...

that... or you're living in some cold place... for you to be not thinking of these sort of things...

the first time i heard of this is from this guy...

http://www.figure.fm/en/post/14675/PVC+material+degrading.html

this guy's situation may be hypothesized that the boxed figures has accumulated a certain amount of humidity than the unboxed ones... given that the boxes are not airtight...

a prolonged humidity and trapped fumes may be the cause of this phenomena...

another could be that there is this paint gradient agent that is used in these figures that somehow didn't work well on prolonged concentrated exposure with the fumes...

there are a lot of factors for figures to degrade like this...

like a bad production batch... which explains why same figures didn't end up the same on a same environment...

or the figures received an adequate exposure during shipping... but not giving an immediate reaction... like i said... the oil tends to move out... once it moves it don't just simply crawl in back to place... it just stays there until a condition enables it to move out again...