Not sure if this is working as intended or a bug, but a month ago I was grind crafting on different jobs. Grinded one craft for an hour, took an hour break, then started on another craft. Well about 20 min or so into the second craft, I'm suddenly failing every synth attempt and even hitting an unstable element within the first 30%. Now I went from completing crafts with a comfortable margin of durability left to having my attempts break to near break on finish.

I've looked for other posts on this issue, but I can't say for sure if this is crafting fatigue.