I was going to comment on this too. I notice this happens with what feels like more traditional plastics - what exactly is going with these? It feels like over time they are breaking down and liquefying, or releasing their oils?
As far as I can tell, it breaks down slower the more you use it, must be interacting with oils/something from human fingers, as I only have that happen for things that remain in storage for months/years at a time, but the gear with that sort of plastic that I use every day/week doesn't have that happening.