Hello, my name is Rusty. The first thing I want you to check is if the network cable is still attached to your router, and at the DVR. Once you verify the network connection, I want you to delete the app, and reinstall it. It can get disconnected with the IP address. The next thing to check is if your internet service provider is providing a static IP, and that your app is connected to that IP address. You will have to call them to verify. Tell me what you find.