@jeffm_614, the wired speed is still 400 Mbps (sometimes goes to 500mbps as that is the speed my ISP provides). The QOS test also shows this speed, but my devices are connected to wifi and the speed...

I have two Deco M5 units (one as main unit and the other as satellite) that worked fine until yesterday when the speed dropped significantly from 400 Mbps to 72 Mbps. The firmware was updated to...