@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.

@CybervinnyDeco What you see is not right. Minimum one Deco per floor is correct for the house that size. In any case, just adding Satellite Deco on a different floor of a house should never cause...

@StA There is one more thing you could try, if you are OK with experimenting. In Deco app find Deco node to which dishwasher is connected, and open that Deco page. There, you should see dishwasher,...

@Andesch It is possible your 2.4GHz devices unable to handle dual band SSID. I have older model of Ecobee thermostat, I had to set it on Guest Network with 2.4GHz only, as it can't handle dual band...