Mevo has a feature that will automatically power down the camera after 15 minutes of inactivity. This means that if the camera is turned on but the app is not connected to it, Mevo will shut off on its own to preserve battery power.
You can choose to disable this feature by going to settings, then tapping General.
Here you will see an option for Auto turn off with a toggle switch to the right. Toggle the switch off, then close the settings.
Now Mevo will stay powered on until you manually turn it off.