@Marc196999
Hi, without details, it is hard to say what might be the problem.
But there are some instructions for your reference.
If you are connected to the Wi-Fi of Deco, the local control via Deco APP should always be accessible even though Deco might not be connected to internet service.
While if the smartphone switched to 4G network suddenly, the APP management will be over the remote control.
If the Deco is not found on the APP, It might be temporarily disconnected from the cloud server.
So if later you have seen the same issue, you could check whether the smartphone is on Wi-Fi or 4G network.
Then it is suggested to go back to Deco APP>three lines on the top left>help>contact us>suggestions and save the APP log.