Andy has mentioned these problems - and it's causing of Print head crashes!
Turns out - this dude Zack - covered this issue in a YouTube video. I just learned about this video from a co-worker here, actually one of the Eng's here at Pako - a young dude who has been doing 3D Printing with a Bambu machine (I think it's an A1 - with the AMS) - and we were talking about PCTG - and it's from Zack that he learned about PCTG.
I just found it Ironic that Zack is talking about the problems with Silk PLA (and video is actually TWO Years old) - and this is the point in the Video where he talks about the problems with Silk PLA:
-K