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CM1000 Xfinity issues
I am quite frustrated at this point. I had a CM600 modem to support Comcast's Extreme 150 service. I've had it for a few years and was consistently getting 160 to 170mbps speed from it. About thre...
Well it is finally fixed. The tech showed up today and I showed him the two frequencies that were having the problem. He checked outside, and then at the tap. He came into the house and said he needed to call a bucket truck in to fix it. I got a recorded call from Comcast that they were working to fix the issue. I got a second call an hour later that the issue was fixed. I ran a speed test and got a consistent 160mbps (yay!). I used the reset button on the modem and let it re-provision. All the signal/noise and power levels were good and there were no uncorrectable codewords. They didn't tell me what they fixed, but at long last, it is fixed.
I don't want to hijack your thread but I just want to add that I am having very similar problems. My internet was having identical issues to yours however on Friday my internet stopped working all together. Since then Comcast has replaced all the lines to my house and inside yet the CM1000 still goes not get any internet. What is weirder is that I am getting an external Comcast IP address assignment but Comcast says they cannot see my modem respond. Additionally connecting their rented equipment and provisioning it to the account works without issue, provisioning the CM1000 back to the account results in no service at all. I am really looking forward to seeing a response on this because I am also out of ideas.
I too am havng similar issues with my CM1000. Comcast has tried some of the same changes with my cables but nothing is fixing it. My CM1000 averages 35,000 errors daily both Correctable Codewords and Uncorrectable Codewords. I get error logs and drops daily and my firmware version is v3.01.04. It was doing the same with the previous version but maybe worse now. They just don't seem to know how to fix these issues in our area. Issues with Xfinity just went down hill ever since switching to Docsis 3.1. I have tried a different CM1000 with the same results.
In my case I feel Xfinity is having issues with Docsis 3 in general as thats when our issues started up. We have tried all the brands on the Xfinity list including a loaner from them. I think the CM1000 got worse with the latest firm ware update.
I think this is an issue with xfinity and docsis 3.1 modems. I have tested two netgear cm1000 modems and an arris sb8200.. both of these are the top of the line docsis 3.1 modems and all 3 had identical issues at my house. The second I went out and got an arris sb6190 (one of the fastest docsis 3.0 modems) everything worked perfectly. It also worked perfectly with the rental modem which was also docsis 3.0. I think its fair to say this issue is isolated to docsis 3.1 modems.. atleast on my network.