wifi speed going too much from 700 down to 90 for AC4000/ R8000P

Speed testing with a wired PC? 

 

What is the Mfr and model# of the Internet Service Providers modem/ONT the NG router is connected too?
Be sure your using a good quality LAN cable between the modem and router. CAT6 is recommended. 

 

Try disabling the following and see:
Armor, Smart Parental Controls or Circle, Traffic Meter.

 

Has a power off for 1 minute then back ON with the ISP modem and router been performed since last update?
Be sure to restart your network in this sequence:
Turn off and unplug modem.
Turn off router and computers.
Plug in and turn on modem. Wait 2 minutes for it to connect.
Turn on the router and wait 2 minutes for it to connect.
Turn on computers and rest of network.

 

Has a factory reset and setup from scratch been performed since last FW update? A complete pull of the power adapters for a period of time after the factory reset then walk thru the setup wizard and setup from scratch. Recommend setting the default DHCP IP address pool range to the following after applying and a factory reset: 192.168.#.100 to 192.168.#.200.

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Alexnguyen wrote:

 

wifi speed goes down from 700 to less than 100 MB per second after i had reset it.

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Hard to see how anything could give you WiFi at 700 Mbps on that router.

 

It might be worth a bit of background reading.

 

Understand Wi-Fi 4/5/6 (802.11 n/ac/ad/ax)

 

@duckware knows their stuff and can bust a few myths and cut through marketing hype.