I recently got Deco S4 set of 3, but I'm having a bit of an issue with the speed that I'm getting via its ethernet ports. When my laptop is connected directly to the modem I get high 800mbps speeds, but when I plug in the Deco and wire the laptop directly to the Deco (no switch in between, no other Decos in the network) my speeds drop to 200mbps.
Is this expected? What am I doing wrong? Is there one of the Decos that is supposed to be the main router?