There's an abundance of hackers currently running loose on the servers, some floating around in the air, some teleporting and shooting players in one shot from seemingly out of nowhere, they all have the same characteristic on their steam accounts - it's a series of numbers for their names. They have no friends on their steam accounts either, just numbers. I'd survived almost 6 weeks ingame time and suddenly when those guys show up on the server player list, me and 3 other guys, one of which is almost a km away from two of us all die almost simultaneously. They're on the official servers mostly, right now I can log in and find them on each of them.