Poor connectivity with new modem

Sunday, 8/2/2015, I replaced my Zoom modem with a Netgear n600 C3700 that I purchased. I called in to have it activated. I was able to get online and view pages like google.com and yahoo.com, but other sites would not load. The cs rep told me that were outages in the area due to the thunderstorms, and that it would be fine. It is not fine. It turns out I can only connect to a handful of sites - google, yahoo, netflix, facebook... but just about every other site won't load at all. (Page not available) I have done dns resets and all manner of suggested fixes found on sevenforums via my phone's 3G connection, but the problem is present on all my mobile devices, as well, and with multiple browsers. The modem's web ui shows all systems go. The connection also breaks every once in a while. It will usually come back on it's own in 5-10 minutes. A reboot of the modem will also fix it. I have been on the phone with customer support FOUR TIMES, totalling about 5 HOURS. Each time they follow the script and want to reboot my modem and power cycle and empty my cache and clear my cookies and then after all that tell me they will escalate the case to a specialist.  Well it's been FOUR DAYS. I have not heard from one of these specialists who is supposed to call me back. Do these people actually exsist? I know a guy (doesn't everybody?) who tells me it might be that the isp is still looking for my old modems MAC address, even though the old modem has been deactivated and removed from the system. This "guy I know" is a comcast installer. He's an actual cable guy. He says he's seen it before, and has called it in and had it corrected, but that cs reps can't do it.  Is this a thing? Will somebody please fix it before my wife has another fit? All I wanted to do was upgrade my modem.    

TDuncan813 wrote: ... The initial reason I wanted to upgrade was that I was experiencing frequent service drops. ...Please see Connection Troubleshooting Tips. If you want to troubleshoot this yourself and still need help, please provide Information Requested for Connection-Related Posts.
If you are using Wifi it's best to switch to an Ethernet connection if possible while checking the reliability of your connection to Comcast.
If you'd rather have them do the troubleshooting call them at the phone number on your bill or 1-800-Comcast, or chat with them using one of the "Trouble" options at https://www.comcastsupport.com/chatentry/, and have them send a tech out to identify the cause and correct it.
If the tech finds bad coax, splitters, amplifiers, or connections in your home (even if Comcast originally supplied them) you'll probably have to pay for the visit unless you have their Service Protection Plan (http://www.xfinity.com/spp/, about $5/mo). If the trouble is due to a faulty Comcast modem, eMTA, gateway device, or anything outside your home, you shouldn't be charged.

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