Check if your phone's Bluetooth and Wi-Fi are turned on.
Navigate to [Connection Settings] -> [Connection Setting Switch] and set it to Auto.
Allow the App to use your location. You can set it at [Setting] -> [Application Setting]. (Android 6.0)
Check if the App is connected to another camera's Wi-Fi.
Check if another phone is connected to the camera. A single camera can only pair with one phone.
Check if the phone is within 30 meters from the camera.
Check if there is Wi-Fi interference caused by having too many Wi-Fi networks around you.
Navigate to Wi-Fi Settings in your phone and remove the Wi-Fi hotspot manually and try connecting again.
If you've tried all of above and still can't make a proper connection, please try closing the App, restarting your camera and turning on the Wi-Fi again.
If none of the above methods solved the problem, please go to [Menu] by swiping left on Live View and navigate to [Basic Settings] - [Restore to Default Settings] for a reset. Then restart the App and connect to the camera again.