One of the most common beginner's mistakes is allowing the airplane to get too far away. Either by simply flying it out too far or not noticing the distance due to concentration on keeping the aircraft under control. I know, because I lost my H9 Alpha the same way. I was practicing some very basic aerobatic maneuvers and the plane had crept far enough out that I couldn't tell the orientation of the aircraft and when I attempted to pull the nose up it crashed because the plane was inverted. Keep the plane in close to you and at least 2 mistakes high and you will generally stay out of trouble.

Regards,
doubledee