Periodic Disconnections, Periodic Disconnections Options

[Riddick342]

Basically this is my hook up, my computer is connected to a dlink 655 router which is connected to a modem from comcast, i believe my connection is DHCP, there are 4 computers including mine running on the router, basically the problem is im getting periodically disconnected there real fast disconnections lets say im playing a game or on ventrillo and it will just randomly say disconnected from server then i log right back in. Theres basically no way to tell ive been disconnected aside from being kicked off something. Help any1?