I'm a new flyer with a standard Phantom that I've flown 3 times now. I've had a few hard landings where the drone flipped over and the props got bent up a bit. I've managed to straighten them out and they look okay, but today when I was flying, about half the time on takeoff, instead of lifting straight up the drone would tip forward and turn onto the front side. If I sat it on my hard case, which is about 12 inches high, it would tip but still lift off. But sitting on the ground it tipped about half the time. Once in the air the drone flies fine and I'm not seeing any noticable wobble when hovering. Coming down for a landing if I take my time it sits down okay. I suspect the problem is the props. Any ideas?