@mefu Right, I missed that part about only upload impacted. If only upload drops, probably it is not the cable. Sorry, can't help you much with setup you have. Perhaps, someone else will have better...

@mefu Your Main Deco, what is it connected to: is it ISP modem/router, what is it brand name and model number? Out of your description alone I would recommend as the first step to replace Ethernet...

@treichold I know about this issue for 3 years I own Deco mesh, so we can safely assume it is known issue. It survived through multiple interations of Deco firmware upgrades and major Deco app...

David-TP wrote 1. How to configure the connection preference on the Deco APP? How to select a preferred signal source on the Deco App @David-TP This link I left in quote is broken in original FAQ...

@Ilan316 Smarpthone does switch automatically, but not instantly. To switch to a different WiFi node, smartphone must rescan all WiFi networks and choose the new WiFi node to connect to. Rescanning...

@diogo_ For troubleshooting purposes, can you switch MEO Router to gateway mode? That will allow better troubleshooting for Deco mesh.