My game has crashed twice already today because of this bug.
[spoiler]if you don't know what this bug is, when Firefly is activated on an enemy, the enemy you had previously killed (and activated Firefly) will explode again. This explosion will deal damage to you if nearby it, and if activated one too many times, it will cause the game to freeze/crash.
I believe it only affects Primaries because I haven't seen this happen while using Snipers with this perk. Dunno if it affects the new raid auto rifle either.[/spoiler]
Edit - I also crashed in Archons Forge while using the axe's special attack, is this linked?
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Use another weapon, the bug has been around for months now and they have tried to fix it. It's meant to be a pretty difficult bug to fix so I doubt it'll be fixed anytime soon