Hello! Just got a used phantom 1 with a walkera gimball and 2 batteries. it Works fine for maybe a minute but then starts blinkin (Green - red), and (Green-red-red). Then suddenly when i try go a little bit higher ALL RED and starts falling down (im in panic). Similar on the other battery started going wherever it wanted and got it to land sideways. Afraid to fly with it on harder ground because of falling down, has not damaged on grass. Could it be the batteries? (little bit swollen,wiggles a little on flat surface), controller battery? something inside the drone wrong? Any ideas?