I've had the same problem ever since I've had the game. It usually takes about 12-15 bullets to drop someone, stopping power or not. Even if I come up behind a camper & they're facing the other way, not moving at all it still takes a full clip. Router is in DMZ, & I even bought a ethernet cable to connect wired. I've shot a guy in the head about 5 times from just out of knife range, only to have him turn & kill me 1 shot - the kill cam showed me shoot 1 bullet about 10 feet over him & stand there while he shot me 4 times. Been constantly searching the internet for almost 2 years looking for any help, nothing's worked.