Started my phantom up and hovered about 5 ft off ground for a second then all of a sudden this error came up and my phantom started drifting around. I guess it switched to atti mode. I did a hand catch land and calibrated the compass right after. Only had a few minutes of battery remaining after about 15 -20 min of non interrupted flight, so I started up and hovered at 5 feet to see if it would replicate the same scenario. It did ok for the last 2 minutes of flight. But now im worried that this will happen again and im gonna crash or something. Anyone know what could have caused this right after takeoff?