Hi. New phantom 4 pilot here. I am slowly learning. But one thing I have noticed is when I get up to about 50' or so. I let off the controls to let it hover. It will hover for a few seconds then for some reason it will either began to go straight up or coming down on its own.. it will do it for about 10-15 ' then trys to go back to original hovering point. Winds are little to none. I calabrated compass. Is this normal? Something wrong? Thanks for any input.