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Nighthawk AC1900 WiFi Cable Modem Router Model C6900 very low download speed than plan
I have Nighthawk AC1900 WiFi Cable Modem Router Model C6900. Working fine siince last 3 years. I have 600 mps plan from xfinity. Currently started to feel very slow and from speedtest, found very lo...
What CAT# LAN cable are you using between the modem and PC? CAT6 is recommended.
Please post a copy and paste of the modems connection status page.
Have the ISP check the signal and line quality UP to the modem. 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.
Be sure your using good quality RG6 coax cable up to the modem.
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
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router?article=24311
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
How is the wifi configuration set up under advanced wireless settings? Is Smart Connect, Armor, Traffic Meter, Beamforming or MIMO enabled on the modem?
What channels are you using? Auto? Try Auto and 48 on 5Ghz. Or try setting manual channel 1, 6 or 11 on 2.4Ghz and 40 to 48 channel on 5Ghz.
Any Wifi Neighbors near by? If so, how many?
Has a factory reset and setup from scratch been performed since last update?