Im using the 6/6 Rune of the Pack. And when i am gathering, and the proc goes off, my gathering on that node will fail. As if i am using a to low level gathering tool, even tough i use Ori tools.
Ive had this happen before in a certain spec that would proc something when i dropped to 75% health. And other people have had it happen aswell. So i think its a result of proccing effects when you are hit or drop below a certain health.
While gathering, and taking a hit, this can come into effect. And for some reason, it then fails on your entire gathering operation. Its very annoying and im now using 3p of lower quality gear without the runes just so i dont get screwed out of orichalcum or something.