I have a wnr2000 setup per the Cnet Networking forum sticky and we have 2 360's, other machines, WPA-PSK and doing great.
However you have more wifi devices than we do. Maybe you'll have to setup more than one WAP? We discuss how at about post 18 of the forum's sticky.
Here we go.
For the past year and a half I have been running RoadRunner turbo on a D-Link DIR-625 with ZERO issues. About 3 weeks ago; I noticed an ip addy or two that I didn't recognize. I booted the nefarious ip's and set my security to WPA protection. From that day on; I lose net connection (not NETWORK) from once every 15 mins to once every hour; or even as little as 5 mins.
I have 2 360's (one wireless and one hardwired), 3 wireless pcs, one hardwired pc; 2 iPhones and one blackberry join the mix as well. I have never had a problem up until then.
I got sick of it and went out a bought a netgear WNR2000. Hooked it up and was thinking, "Sweet! I fixed it!!". To little avail; the net crashed in about an hour or so.
I changed everything from the MTU to the security settings to setting static ip's.
I have brighthouse coming today to look at my lines and the modem.
Help me please; this is killing me.