From IGN: “In October, Star Wars: Battlefront 2 players began mass-reporting an issue that made entire lobbies of characters unkillable. By December, the problem was widespread enough that many declared the game unplayable. Now, a community manager from developer DICE has promised fans “it will be fixed.”

The issue appears to affect multiple Battlefront 2 multiplayer modes on PC only, and sees full matches of players rendered unable to be reduced below 1HP – effectively making games pointless, ending only after a timeout or, more likely, after every player quits.”

Source: N4G PC Star Wars: Battlefront 2 Multiplayer Has Been Broken on PC for a Long Time, But 'It Will Be Fixed'