This is something that started happening fairly recently. I really don't know what to do from here so I'm going to explain what is happening and please let me know what other information you need. My husband and I each have our own Xbox 360s, a PS3 and this COMPUTER connected to a router and a modem with Time Warner Cable internet. We were originally using a Buffalo wireless router and for a couple of months we had no problems with the connection. Suddenly we started having a problem with connecting to Xbox Live at the same time. Usually how it would happen is one 360 would already be online and when we tried to TURN on the other one it would say that the connection was unavailable. No error message or anything, it just wouldn't recognize that the connection was active. We thought maybe it was a problem with xbox live but this started happening with the PS3 also, however the computer seems to be immune to this problem. The only way to fix it is that when it happens we need to unplug the modem and router then plug the modem back in, let it boot up and plug the router in. After that it will work fine. Our Buffalo router messed up so we bought a Netgear 5-port GIGABIT Ethernet Switch(GS605), but we continued to experience the same problem. I've called time warner and they just keep saying nothing is wrong with the connection and rebooting the connection on their end which ALWAYS fixes the problem. The problem can be fixed, but it seems like there is no way to keep it from happening again. I really have no idea what to do from here. Please please please let me know what other information you need.Quote

The only way to fix it is that when it happens we need to unplug the modem and router then plug the modem back in, let it boot up and plug the router in. After that it will work fine.