Nighthawk RAX120 - Fast Wireless Download Speed, Slow Wired

I am having the same exact issue with my RAX120. Router Firmware Version V1.0.1.122

1- test the speeds. They are low, 25-250mbps

2- open router's QoS page, change nothing, click apply

3- test speeds again, now getting 400-600 mbps
4- wait a while

5- test speeds. We are now back at step 1. Infinite Loop.


Seems like a prety glaringly reproducible issue. As far as I can tell from looking at this forum, Netgear has been knowingly selling us an entire line of routers that promise better performance that they do not even come close to delivering. I am developing the impression all of the RAX routers have the same issue. I RMA'd  mine and the replacement is doing the same thing.
Seems it's not a quality control problem, in the traditional sense, where manufacturing inconsistencies can introduce possible bugs to a few units. This appears to be a flawed design that predictably performs this bad for all customers no matter what workarounds we try. The product appears fundamentally incapable of delivering the speeds promised for longer than 1 day. After months there is still no fix. How is there no class action lawsuit??