A new game settings update has just gone live in Black Ops 3. This fix addresses the aforementioned cryptokey farming, glitch fixing as well as additional boosting.
43.*.33.5 – “Additional boosting, farming, and glitching prevention in MP & ZM,” David said matter of factly and without offering any clues.
— David Vonderhaar (@DavidVonderhaar) January 11, 2016