Looking to buy new router supports 2 or more Xbox,s

My old Wireless Router Netgear DG834G was great for me. Would only get one Disconnection. I only changed it because of the 2 Xbox 360's that needed a Router that supported both Open Nat for Both consoles. So it's Still doing it. I have changed it to
different Channels. I am going to buy a new Router in a few weeks. I think it's because it transmits at 24 Mbps. According to the Specifications on the net.

if you want to have more than 1 xbox connect you have to enable UPNP in your Router. Disable all DMZ and Port Forward. and restart the router.

If it doesn´t work and you want to buy a new Router, I would by a Router who supports DD-WRT Firmware.

if you have a linksys router you will not be able to fix this issue, id suggest looking at forums under listed routers that support multiple Xboxes simultanously, i have same issue and am currently buying a new router. and you should always port trigger
not forward first. FYI.

If your both in the same house some routers don't allow 2 Xbox 360's playing at the same time. Try looking up troubleshooting for your router.

1. I test the xbox live connection and it says a big X from the xbox 360 and router timelime looking thing.

2.S

3.Yes i have played on live for about a year and this is a new problem

4. I disconnected my iPad my Computer my 3DS from the router and the router itself and also disconnected the router data from the xbox

5.IDK what that means