@Marvin_S Hi Marvin, As expected it has once again reverted to under 200Mbps. Best, Adam

@Marvin_S Hi Marvin, thanks for the reply. To answer your points in order: 1. I always use speedtest.net and the results are consistent regardless of server chosen 2. I have connected the PC directly...

This has been the case since at least 2020 (purchased the router in 2019). Is it just broken?

I have an Archer C5400 V2, and have used the same through multiple firmwares, currently on the newest 1.2.9. Regardless of the firmware used, the router will over a period of time, sometimes 6 hours,...

@Kevin_Z Resetting the router to stock settings appears to have fixed the issue for now, I will do all of this and report back if the issue returns.

Hey there, I'm having the same issue with the same router and firmware version 1.2.5 Build 20190411 rel.52981(5553). I had the same issue on firmware 1.2.2 also. We should be getting around 200 Mbps...