The last couple of time i've played mp i've been dying for no reason, i'm just running a long then dead. no one has killed me i just die, has any one else had this happen to them?.

lol yes, happened to me on city hall. i was running, and then i just suddenly stumbled over to my side but i wasn't dead though! i was just lying on my side xD

yeah.. same happened with me, dont know what the map is called i was under a collapsed bridge i thin.. BOOOM!! im dead what? took a while before i could respawn after that too.. i was just lying there for a while. weird

If there's no kill cam it was suicide. Otherwise you should have gotten some info from it.... 3 option: glitch

It's a glitch. Spots like those were also in Uncharted 2 or BFBC2. You jump/run over a certain spot and you're instantly dead.

there are also many spots that will drain you out of energy and get you out of stealth , terminal is one of those maps , it s near some stairs where the ground is broken.