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Zaprey's avatar
Zaprey
Aspirant
Jan 02, 2020

Gigabit speed being throttled down

So we have 1000mbps internet plan with Comcast Xfinity. 

Modem - Netgear Nighthawk CM1200 Cable Modem 

Router - Netgear Nighthawk XR700 Pro Gaming Router

Both are up to date with Firmware

Connection is as follows CM1200>XR700>PCs, Xbox..etc

all hardwired via ethernet cat6 except for the modem to router which is on a cat8

 

We get 700-950 download and 40 upload on our hardwired PCs

We get 400-600 download and 40 upload on our hardwired xboxs

and we get around 100-200 on our phones via wifi. 

 

The problem is that after about 1-2 and a half hours the speeds go down to 20-30 mbps download and 20 upload on all devices at the same time. It will stay at these speeds untill we reset the modem. But then after we reset the modem about 1-3 hours later the cycle continues. This has been happening since we got the internet set up with our new plan. Comcast claims everything is good on their end and to call netgear. We have called support from our ISP over a dozen times and no luck.  We had an Asus router at first and thought that it was the issue but now with a new router the problem still consists.

8 Replies

  • So I legit have the (almost) exact same setup and same thing happening to me. (xr500 instead) For the past month I've had major ping spikes and inconsistent downloads using the router. When I plug directly into the CM1200 speeds are perfect so it's definitley a problem with the xr500. All of these companies are starting to make trash routers. I'm close to just buying cheap expecting to replace every 6 months...

  • plemans's avatar
    plemans
    Guru - Experienced User

    If you're having the issue on multiple routers, then it tends to point at either the line coming in, the modem, or some way you're setting up the routers. 

    Comcast technicians aren't the best for phone support. they're main goal is to get you off the line. 

    Do you have a screen snip of all your modem connections info? This can help a lot. As well as the logs. 

    If you have any splitter, attenuators, amplifiers in line, I'd recommend removing them. Preferably, I'd also recommend moving the modem to right where the coax enters the home. If that isn't possible, inspect the line for any damage, kinks, cheap/poor connectors, loose connectors, etc. Even small things can cause issues when you're running gigabit. 

    You've put that its happening every 1-3 hours roughly. If you hardwire into your modem for that period, what speeds do you get? 

    Are you using any port aggregation features?

    • doeichel's avatar
      doeichel
      Aspirant

      Same issue. After reboot, 1000Mbps down and 40Mbps up.  3 hours later, like clockwork, drops to 20-30Mbps down and 20-30Mbps up.  Signal strength is fine.  I do have link aggregation enabled - which is why I got this modem/router combo.  Did anybody get this resolved??

      • plemans's avatar
        plemans
        Guru - Experienced User

        doeichel 1. Disabled link aggregation. netgear might have a fix but if the ISP's don't roll it out, not beneficial. 

        2. If you want help, try starting your own thread and we'll be happy to help you.