The latest patch for Bungie’s Destiny: Rise of Iron is now live and it fixes quite a few things with the game. For instance, an issue that caused the Taken version of the Winter’s Run Strike from not dropping Skeleton Keys at the correct rate has been fixed. A glitch where players could access Skyline’s rooftops in Crucible has also been fixed.
However, the hotfix also nerfs the farm for SIVA Key Fragments. On Normal difficulty for Wrath of the Machine, killing a boss once will net you three fragments. The second time drops two and the third time nets you one. Until the next weekly reset, you won’t be able to obtain any more fragments. The same goes for Heroic raid bosses.
Source: Rheena.com