My router works just fine with all my systems unless they either are rebooted or drop the network connection.?

Ok, I had the same problem, with a D-Link WBR 1310, I was really pissed, everytime I called D-Link they told to call AT&T, and have the DSL modem bridged, then they told me the modem wasn't compatible with the router, and all this BS, I was about to throw the router away, but I decided to call D-Link one more time, and asked for a supervisor, of course, this guy knew way more than the previous agent I talked to, so I explained the problem, we have 1 comptuer hooked to the router wired, and 2 wireless, they work great at first, but after a few hours, they all disconnect for no reason, and the only way to fix it is turning router off and on again, well there was an IP ADDRESS CONFLICT, Both my DSL Modem and D-link router had the same IP Address (192.168.0.1), you know to access their utility and configure settings, so this guy walked me through and we changed the router's IP Address to (192.168.1.1), so they would be different, and there will no longer be any conflicts. DONE, It's been like this for over 4 months, NEVER Disconnected again, all computers have very fast internet, and also the xbox, so most likely you have a ipaddress conflict between your dsl/cable modem and wireless router. Good Luck

Configure your router to only accept certain IP's (192.XXX.XXX.XXX) and give each computer its own IP