Just bought this for my Comcast service that I started up in September. It is constantly dropping the connection and going offline. I've been through all the troubleshooting with Comcast and now they want me to replace my modem. Ha! If only they knew I just bought it! Not to mention it sounds like there is something loose inside of it. This couldn't possibly be my fault considering it has been peacefully sitting on my desk from the minute I opened the package. What a waste of money! >: (Now with the cost of this modem + $ Comcast to come out and attempt to resolve the problem+ the cost of my new modem= Enough money for a significantly nicer modem that probably even works!