CM1000 Xfinity issues

DarrenM BigQuark The same issue this morning as the previous post.  My download speed was 1.5mbps.  This time I unplugged the modem and waited 60 seconds and plugged it back in and it cleared the issue.

DarrenM BigQuark any update on this issue?

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.

martyr444do you think this is an issue with Xfinity or with the Netgear.  When their modem was put on, I was getting 175mbps.  I am wondering if I should just bring the Netgear back and go with a different vendor.  I really don't want to rent a modem from Xfinity.

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.

irakhlinit makes sense.  Xfinity is rolling out gigabit Internet service in our area to compete with EPB.  Hopefully Xfinity and Netgear will sort this out soon.  I am paying for service I can't use at the speed I am paying for.

My log now has bursts of errors.  It may be a 1 or 2 or 3 hour time frame that peppers my Cm1000 error logs, then it clears up.  After calling Comcast several times I am convinced the customer service reps are starting to hear more and more of CM1000 issues when using D3.1  Mine modem was just fine on the 24x3 D3.0 but went haywire when the firmware was updated and a D3.1 D/S channel was deployed in my area.  
I am on a Cisco CMTS judging by my CMTS MAC and I think that is where the problem lies.   Comcast had a similar problem whith the Motorola SurfBoard 8200 activating on Gigabit Tier.  The problem was the CMTS and a Comcast Engineer had to log into the CMTS and manually activate the 8200's.  That issue has largely been resolved but that is what leads me to believe this also is a CMTS issue.   Still no resolution, however.