If they were working fine before and are acting up now, trying power cycling your router and your modem.
What kind of router do you have? I think you should have DHCP on so that the router automatically assigns an IP to any device that connects to it, rather than setting it manually through each device connecting to your network.
Threads of Interest:
The Movie Thread: http://www.vgchartz.com/forum/thread.php?id=6880
The Crow Eating Thread: http://www.vgchartz.com/forum/thread.php?start=0&id=3886
The Betting Thread: http://www.vgchartz.com/forum/thread.php?start=0&id=7104
Custom GIFs Thread: http://www.vgchartz.com/forum/thread.php?id=18963
The Greatest Game Ever Conceived On Any Platform
Tag: "I have tasted Obi-Wan's bitter tears"