IT 308 WIFI disappeared in the app

Hi, I have an IT-308 WiFi, I added it in the app and it always worked without problems but since some time if I don’t use it for a couple of days when I turn it on again it disappear from the app and I have to add it again as a new device!
Any idea about what’s happened?

Just to confirm, are you using the latest version of the INKBIRD app?
Please provide the country, phone model, and device ID of ITC-308-WIFI to Engineers will check it.