I purchased netgear 3.1 Modem and Netgear 7800 Router in Nov. 2018. Both are about the best you can buy and Comcast recommended the package. They told me they were changing over to 3.1 in about 9 months. I have 150 Mbps Peformance Pro Internet Package. I was getting 175Mbps on channel 5.2 with very little range but only 80 Mbps on 2.4 with better range. In Dec. my channle 2.4 droped to 23 Mbps barely runs two of my Tv's that re only 35' feet from my router. My laptop still sees 150 Mbps 50 feet away from my router on channel 5G but not my TV's. I would think a LG 65" OLED TV would have a better wireless card than a HP Probook 450 G# laptop but it doesn't. This slowdown of channel 2.4 has happnened with my last 4 modems and 5 routers over the past 19 years. I have been with Comcast since 2000. This slowdown ocurrs during the Winter months in FL. I believe it is caused by the influx of Snowbird population which increases the use of channle 2.4 by 60% during the months from Nov to May. I was told by a Comcast workman that the Comcast trunkline system which should be firber optic and not coaxial is wired in series rather than parallel which of course dilutes the bandwidth during peak usage times and everytime a new user signs on. It makes no sense for me to upgrade to a 250 Blast because those users are experiencing the same slowdown. Comcast won't fix the problem and could care less. They make excuses and usually blame the customers home wiring. Mine has been check and double check a half dozen times in the past 6 months.
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I currently have a new Netgear 3.1 Modem and Netgear Nighthawk 7800 Router which are both powerful and expensive. I have tried 3 different modems and 4 routers over the last 20 years. My 5Gz is now 175 Mbps but has limited range about 40' so I use 2 Netgear Wifi Range Exteneders to use it for my 4 ROKU powered TV's. My 2.4Gz was 68 out to 75' but has dropped to 10 Mbps since Christmas and still there. The yearly massive influx of FL Snowbirds which starts around Labor Day is the reason for the 2.4Gz drop for the last 20 years. Comcast should do something abou the slow 2.4Gz speed problem instead of blaming users poor equipment. The equipment is not the problem. I was told Xfinity is supposed to switch to 3.1 Docs starting in about June of 2019. That should help I think. A comcast repairman told me that there is a AM radio station in Punta Gorda that can interfere with the 2.4Gz network, I am very disatisfied about Comcast 2.4Gz poor performance and should not have to add two Netgear Wifi Extenders to get 50 to 75' range with the modem and routetr I am using. User equipment is not the problem. Comcasts failure to use Firber Optic cables instead of outdated wired trunk lines to deliver our internet service are the problem along with the fact that the entire internet sytem is wired in series instead of parallel which means the more users on your trunk line or street the slower the interent speeds. I was told about this problem by a Comcast repairman 15 years ago. Comcast does use some firber optic cables but has to rewire the entire user internet system using them.. Until then we will have to live with this slow 2.4Gz poblem.
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