You will find that is what helicopters do. It doesn't matter what size or type or brand. Heli's are inherently unstable beasts and always want to be anywhere but where they are. Keeping it in one spot is simply part of learning to fly a heli. The more you practice, the easier it will become. Just don't let it get out of hand. Set it down, pick it up and put it back in the center of your hovering area and try again. Remember, once a heli starts moving in a direction, if left unchecked, will keep accelerating in that direction.

Rod