CBR750 not tranmitting

Question

Hello, have very the same issue with CBR750. Since Fall of last year either after NG FW update and/or xFinity work, my CBR750 stopped responding back to Comcast, xFinity app always shows as it is offline, and connection drops every 2 days or so. I had xFinity drop a brand new line from the street poll to the house, no splitters except grounding (required by the code), and still have issues

slosrt8 · Answer

Yes. Same issue I was having. Not sure what changed but think NG should have been in better contact with Xfinity to prevent this kind of bad customer experience. I have tried several other brands and had different issue with them. So sad to say that I am currently renting the Xfi gateway with a Wifi pod and have had no issues with dropped connection or Wifi since I installed it after picking it up from the local Xfinity store. I know in my market they stopped the 800mbps service and have 1.0 and 1.2gbps service tiers. I currently pay for the 1.2gbps tier and get 1.4gbps when I do a download speedtest.

zigor911 · Answer

i was suggested by xFinity to upgrade from 400 to 800 plan based on number of my connected smart devices (which is BS to me, but i decided to give it a shoot), didnt change anything. I started with CBR750 back in August of 2021 with 3 satellites. Everything worked well, would loose connection once every 2 weeks or so, and Modem was transmitting back to xFinity so i saw it being online. But for the last 6+ months, after several FW upgrades from NG and "service improvements" performed by xFinity in the area, things got progressively bad. Dropping connections, not transmitting back to xFinity so it reported off line all the time. Local head tech tried to help, he run a new cable from street poll to the house, no splitters (except inline connector for grounding and inline power reducer to keep signal strength within NG guidelines). My modem is still dropping connection every 2 days or so. I am beyond frustrated.&nbsp;

FURRYe38 · Answer

What Firmware version is currently loaded?
What state are you located?&nbsp;
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I see some Correct and Un-Correctables that should be zero'd like the other channels.&nbsp;
Power look ok.&nbsp;
Have the ISP check the signal and line quality UP to the modem.&nbsp;Be sure the ISP provisions the modem correctly.Be sure there are no coax cable line splitters in the between the modem and ISP service box.&nbsp;Be sure your using good quality RG6 coax cable up to the modem.&nbsp;Start with removing any amplifiers, signal attenuators, or splitters from the coax.From there check the line for kinks, damage, moisture in the line.Check the connectors for improperly made ends, foil touching the copper coax line, loose connections, bad/old/cheap connectors, or corroded connections. Replace them if you do.Be sure to power OFF the modem for 1 minute then back ON.https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853
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Please post a copy and paste of the modems event log page.
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What is the size of your home? Sq Ft? What is the distance between the router and 📡 satellite(s)? 30 feet or more is recommended in between RBR and RBS🛰️ to begin with depending upon building materials when wirelessly connected. https://kb.netgear.com/31029/Where-should-I-place-my-Orbi-satellite ‌‌🛰️
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Has a factory reset and setup from scratch been performed since last FW update?&nbsp;A complete pull of the power adapters for a period of time after the factory reset then walk thru the setup wizard and setup from scratch with a wired PC and web browser. Recommend setting the default DHCP IP address pool range to the following after applying and a factory reset: 192.168.#.100 to 192.168.#.200.I would power OFF the ISP modem for 1 minute. Factory reset the Orbi router and power it off. Power ON the ISP modem and let it sync. Then power ON the Orbi router and walk thru the setup wizard again using a wired PC and a web browser.Press the back reset button for 15 seconds then release.&nbsp;https://kb.netgear.com/31486/How-do-I-reset-my-Orbi-system-to-factory-default-settingshttps://kb.netgear.com/000062081/How-do-I-erase-the-configuration-settings-on-my-Orbi-WiFi-System?

slosrt8 · Answer

Your setup sounds just like mine. FURRYe38 is a great resource. He is very knowledgeable, but I don't think 100% is on Comcast. I think it might have something to do with FW updates and maybe a issue within the FW causing the issue. But let FURRYe38 walk you through some troubleshooting and it can most likely get you more stable than what you are now. Just for testing purposes, I would go get a Xfinity modem and try it for a week and see if you have any issue. My guess would be you won't have any. Let me not speak to loud cause I haven't had any, and I am going since 12/27/22 with the xfinity modem and pod. It's been solid. Hope you get it figured out.

zigor911 · Answer

thank you for response. I am on the latest FW for the modem and satellites. and in NJ, near Atlantic City.The new cable line was installed several months ago, when I was bugging xFinity support almost daily, complaining. The local head tech checked the line, there were splitter inside the walls, so he suggested to install new line. And they did using new RG cable that meant to be used for high speed internet and digital cable. Corner of my house is 20 ft away from the street poll with their box. The had to make a small loop to ground the cable and then right into the house to the modem. No splitters, no extra cables. Inline reducer to lower the signal level. Several Correctables always where there. I showed it to him. Tech used his tools to troubleshoot and he showed me that signal is NOT fluctuating - the line is fairly flat. So from his point of view - nothing else he can do.

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CBR750 not tranmitting

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