I’m getting frequent Offline messages as of the last two days. Nothing has changed with my network or locations of AP/Garadget. When I get the error, my iOS 12.0.1 Garadget app shows only a dynamically changing signal strength reading but the rest of the WiFi radio section is blank.
To rule out power related issues before troubleshooting other areas, please try temporarily replacing power adapter and usb cable. Any USB charger/adapter and micro-USB cable will work for the purpose.