@Amano7 You will not need to reset everything, if you are replacing Main Deco. Add new Deco as a Satellite, then promote it to Main Deco and all your Deco mesh network configuration settings should...

@tecoholic This still could be a cable issue. The cable might be just barely good enough for Decos to establish Ethernet link, and ocasionally they fail to. You can do two tests to check that theory:...

@Gurry I am surprised your 2nd floor Satellite Deco has strong signal to Main Deco. Usually, one floor is OK but connecting through two floors is often too much for WiFi nodes. Depends on floors...

@Gurry I'll give you recommendations below, try them and let me know if they do or do not work for you. 1. The recommendation to turn off Fast Roaming is applicable mostly to old devices such as...

@timbish You need the ability to configure Satellite Deco where to connect to. TP-Link has not released firmware for Deco E4 that has his feature and it is not clear when or if it will be released....

@FerryL I've seen these log lines for two years, since I bought my Deco M9 Plus set. Just ignore them.