I think you're aware of this problem, but the hacker wants us to "pester BIS" with the issue, untill he stops.
I'm not obeying the fool, because he's too dumb to use this feedback program himself, much rather than hacking the entire game, but i'll report it either way.
About 3 days ago it started, a message would appear on the middle of the screen saying something along the lines of "I will not stop until BIS_fnc_Mp is blocked" or something like that. With that message, every player online would get launched into the air in a basejumping stance, until they crash into eachother.
This has been going on for a couple of days and every day he made a new text, right now it's at the 4th, where he tells us to pester BIS until they fix this "Leaky bucket of a game". Obviously this man can't read the ALPHA tag.
In the first version of his hack, i also had it in singleplayer. Rumors are restarting the game would have stopped this, but i did not try it. I did play singleplayer recently without starting multiplayer, so i think your game gets "infected" as soon as you hit up a server. {F19135}