I have a WIFI version of the cooker and have the same problem. Everything works perfectly well when I'm at home, when my iPhone app and Anova cooker are on the same home network they talk to each other no problem. I leave the cooker plugged in in the morning, check my app to make sure it sees the cooker and leave. At work my iPhone connects to WIFI here but when I open the app I get this message "looking for Anova, move into range". I tried to connect just using my phone data plan (WIFI turned off) and no connection either.
Is there something I'm not doing correctly?