@Tanis I used this TP article: https://www.tp-link.com/ca/support/faq/2958/

I downgraded to 1.1.7 and everything now works like it used to except the app only show 3 devices connected (they are wired) all wireless devices are missing but are actually connected to the WiFi.

@mpaetsch I am also having the same issue, i have 1 wired satelite that works fine and the wireless wont connect unless it very close to the main. Same setup worked great for a long time untill i did...