My P3 pro gives this warning. I'm out in the field and cant check what this warning means. I'm close to restricted area as I also get this warning on screen. I tried a smal liftoff but quad went a bit "crazy" so I aborted the flight. I was out on a big concrete-road so I think maybe the compass went crazy by lots of iron in the concrete-road. Take off was from the concrete as well. So I think this was the reason for the "crazy" flight. But very heavy wind too, so I didn't take the risk to fly more.