Inkbird ITC-306A losing the listing in app after update, now not connecting to wifi anymore

After every update of the app, my inkbird dissapears.
My first question is, what is wrong? i want my inkbird to stay in the app after update. When i am on holiday this is a disaster!
Second: i cannot reconnect it to wifi.
I pressed wifi button 5 to 8 seconds and light went blinking fast for maybe 3 seconds. then went blinking slow. What does this slow blinking mean?
Adding the device to the app does not work
I need help connecting it again.