@Proterra The best WiFi speed I ever got from my M5 is 475Mbps. Realistically, expect around 400Mbps from Main Deco M5 and any Satellite Deco M5 with Ethernet backhaul, about half of that on...

@Headcoat Turn off WiFi network in ISP router, use Deco mesh WiFi network.

@WiCreekPaddler My recommendation would be to swap Office Deco M5 with Antenna Deco M4R. If this is hardware issue with specific M5 unit, the problem will go away.

@WiCreekPaddler I am getting conflicting info from you. You said "The deco M5 is plugged into the modem directly. The other port on the deco M5 is plugged into my PC, which never has any issues" -...

@Xenomes >Ok had try that, do you recommend a satellite with the less devices? I would recommend Satellite that is not taxed with Ethernet traffic. Smart TV is 100Mbps link at most, very lightly...

@WiCreekPaddler OK, so this is not just "one out of four units" you have problem with, but Main Deco specifically. That fact will eliminate many theories and unnecessary troubleshooting. You do not...