My ISP router is giving 100 mbps of download, while my main deco is giving 10-20 mbps. I have tried both ethernet and wifi and no chance. The main deco is connected through ethernet cable to the ISP router. It does not seem to be the cable, since I used the same cable directly to my laptop and got the 100 mbps.

I have 3 deco's set up as mesh, 1 connected via ethernet and the other via Wifi. No changes in speed from either. I use the mesh network for my smart home set up, although is not a big set up (mostly smart switches and alexas in an apartment).

In my mind this started happening some months ago, but can't pin point when exactly it did. At the beginning, when I first purchased the Decos, the speed was just fine all around the apartment.

I really need help figuring out the problem, as all posts and fixed I have found have not worked.