Why does my Cable Internet keep on dropping its connection?

One possibility, which affected me a year or so ago with another carrier, is that they're altering your dynamic IP address and that's causing router problems.

I'd call Comcast to see what they say, but it's possible you need a new router. Of course, you say you need to power-cycle the modem, too, so perhaps that's at fault instead. Call your ISP... it can't hurt.

I have had the same problem. I used to use a Linksys wireless B router- worked great and I never needed the faster speeds of G. Poor little guy couldn't get it's signals through the walls in my new apartment (new apartment, really old building- thick, old school plastered walls) so I got a new one- aNetgear wireless g router. It worked flawlessly as well but would not work with my 360, so I sold it and got a Linksys wireless G. That thing sucked, hard, so I returned it and got a new one (same Linksys model).

Worked great... ususally. For the better part of last year, I had to reset my router almost every day. It seemed that any time more than one computer used the router in any given day, it would lock up and crash.

Weird thing is that once I sold my macbook and started using my iMac, the problem pretty much went away. I still have to rest it ever once in awhile (every couple weeks or so).

Stupid Comcast.

Are the modems lights dropping out, I had this problem the other night when my modem lost connection. I would say its more then likely a Comcast problem either in the network or at the head end.

check the wiring outside if you can, see if the cable running into your house/apt to the cable companies box outside is pinched, ripped or otherwise not tip top.

i had this problem, turned out the wire outside was getting crushed by the staples holding it to the outer wall. causing interference the modem couldnt understand so it would reset itself.

A cable modem runs off a normal coax cable, As for Vonage maybe if you are exceeding the bandwidth the modem might kick off.