Nighthawk AD7200 slow, actual, upload speed

[hopmedia]

Download speeds are fast and consistent between online speed tests and Nighthawk app speed tests; however, upload speeds are widely off and inconsistent. Upload speeds within the Nighthawk app are around 25Mbps, but device testing shows wide spikes anywhere from < 1Mbps to 14Mbps. I'm testing from a computer connected by Ethernet and all firmware is up to date. Also, we're paying for 50Mpbs upload from Cox, connect to an Arris modem.

[plemans]

what arris modem is it connected to? 

Have you tested it connected to the modem?

[hopmedia]

The modem is a Touchstone CM8200. I have not connected to it directly. I'll try that today.

[hopmedia]

Likely a stupid question, but how do I test internet speed connected directly to the modem? I assume that's what you're suggesting - to bypass the router?

[plemans]

yes, check your speed from the modem. 

Disconnect the router from the modem and reboot the modem. Then connect a pc to the modem and try it. 

See what speeds you get direct connected. 

After you do that, you can power the modem down, reconnect the router, and re-boot the modem.