LMGs shadow nerfed???

I play Gauntlet with friends most nights and often play support. I'm a big fan of the m123k/m121/m240. I logged on and played a few hours today and the accuracy or hitreg of all these guns is now terrible?! Using them at the same ranges, same game type/mode, same attachments and setup and they can barely hit the side of a hangar let alone a player . . . . i though maybe my game was lagging but then 2 other members of my squad told me the accuracy on LMGs was scuffed on their game too. I hope this is a bug because the guns that really need nerfing like the mini scout and DRS etc are even more like lasers than before. WTF is going on????