Lost connectivity over my network – AV CONTROLLER - US Review

Updated 15 May 2019: The app is currently broken and useless! I love my RX-S600 (wired connection to my router) as well as my RX-S601 (connected via WiFi) - and I have depended on this app to control each of them. I use it to tune to Internet radio, airplay (thankfully both receivers still show up in my airplay controls within other apps!), volume, power On/Off, etc. Recently both devices disappeared from the app! What happened? The app is up to date, and I just made sure both receivers had the latest Network Update applied as well. Network Standby is also still set to On. It’s not ok to break minimum connectivity and functionality! Looking forward to a fix...
Review by SDH-RX-S600 on AV CONTROLLER - US.