@MariaZika If you have ISP Router to which Main Deco must be connected, and haven't changed ISP Router configuration, you could try running Deco in Access Point mode. There are no settings to...

@WadeWilson Sounds like a problem with the switch or Ethernet cable between switch and Main Deco. 1. Try connecting Ethernet cable from Main Deco to different switch port. Also, try different...

@Jeff007 There is no real interference on your WiFi network: look at chart, the only "interference" you see is signal from your Deco nodes. This is incorrect report in Deco app and should be ignored....

@rfrimark Both are valid recommendations. I prefer to start with simpler solutions. To "form a new network" and keep PCs connected by LAN you may need to do some rewiring in your house, perhaps buy a...

@rfrimark I think I've got an idea. Also, I can confidently tell that you are able to print from PCs connected by LAN to ISP Router. It is only wireless devices connected to Deco that can't access...

@PieterBou I would recommend switching your Deco mesh to Access Point mode. You can do that in Deco app, under More/Advanced. I'll add screenshot of the Deco app screen with that setting to the end...