If this notification is displayed in-app, then the issue may be the result of one of the following:
- Poor radio signal quality - there may be radio interference from live electrical activity or large metal objects.
Solution: Try turning on the equipment in a different location at the site.
- Poor physical data link - the USB cord might be partially disconnected from either the RC unit or the iOS device.
Solution: Securely re-connect the cord and try again. If it does not work, try a new cable on the device (preferably from Apple).