I had one time of such DC at the beginning of Patch 2.2. Someone paid me commission and gave me the mats for making the Cashmere Robe of Healing HQ. I made it to IQ9, and was about to use Byregot. Then the DC happened, and all was lost.At that time, my bank was only 850K, and the mats were worth more than 1.1 million. My hands turned cold, and I felt my face out of blood. There was no remedy except started grinding Brayflox HM all day to recover the lost mats... And also asked friends to do me a favor on gathering... Since then, I avoided that time of the day for any kind of important crafting.