When my brother, sister and I try to play online together (360 version), after about a minute, my brother's connection gets dropped. We've played Halo 3, Marvel: UA, and probably a dozen other games on Live! with no problems. Any two of us can play together fine, but when we add the third person, my brother gets disconnected.
Someone suggested that it could be a NAT issue, so we each ran the network connection test, and came up with "open" under NAT. My sister and I tried plugging out 360s straight into our modems, but my brother has a modem/router combo thing, so that's as direct of a connection as he can get.
We each spent $170 mostly to play this online together, so we would really appreciate any help.









